fluorescent light turns off by itself

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When I put the bulb back on the other side, it went completely out again. I replaced the ballast which fixed the problem for about 3 days. When the metallic strip of starter flips back or when the starter switch turns off, the ballast provides high voltage through the electrodes of the Fluorescent lamp. Why would a fluorescent light turn on/off by itself? Dave. I checked and rechecked the ends – and it appeared they were fine. If the fixture had an older magnetic ballast then you may consider upgrading the fixture ballast to a solid state ballast. The control relay should be carefully sized to stay within the voltage and watt specs of the motion detector, and have contacts that are rated for the volt and watt specs of the light fixture. It went out. The housing does not appear to have access to the ballasts. It is one of three units on the same switch. Types of Electrical Testers, Circuit Breakers for Light Fixture Circuits. Thanks for your electrical wiring question Jim. I changed 2 of the bulbs and 2 of the 4 lights came on. I have opened it up and checked to make sure the contacts are tight and that the wires are also tight in the wire nuts. I have an undercounter dual bulb fluorescent light in my kitched. To defeat the local control, it has been suggested that you plug in a 2-way or 3-way tap adapter to the module or outlet. If this condition is discovered then the burnt socket should be replaced and the wiring method corrected to prevent the circuit from feeding through the socket by using a pigtail splice with one lead wire connected to the socket. I am an industrial electrician but don’t know too much about residential set-ups. Let the Light Shine On! Is the fixture 120 volts? Be sure to double check the wiring from the ballast to the sockets, and make sure both pins of the lamps are inside the sockets. They both worked properly for the last six years. First, make sure the new lamp is installed correctly where both pins at each end are all the way into the sockets and making contact after a slight twist. The moment of forced commutation 56 can be varied thus controlling the amount of energy channeled into the load components 14, 15 and 16 which make up load 55 and also controlling the resulting fluorescent light level. If HDMI CEC is controlling your television, it should turn itself off automatically. Dave. I assumed the bulb had gone out so I purchased a new one and am still having the same issue. As you can see, in colder applications it would be best to upgrade the light fixture to an electronic ballast and install new lamps which will eliminate the problems associated with cold temperature. Dave. When you replace a ballast always replace all of the lamps and start fresh. There is on some florescent lights that have a starter. Factors that may be the cause of slow starting florescent lamps: It appeared that the power cord was molded directly into the ballast. Thanks, NJ. I have some other lights that always work properly. Hi Kerrie, 2. I replaced the magnetic ballasts with new electronic ballasts in two sets. The pins are tight and the contact is good. I would like to know what could be the reason for such anomaly and how to fix it. Dave, I have a 2 lamp fixture in an unheated garage. 2 of the 3 light fine, but the other (4-ft) fixture lights for 15 seconds or so then turns off. All of the fixtures are new, along with the bulbs. Dave. I have a fluorescent light that turns off by itself. The power to each light fixture ballast could be tested as well. It is very frustrating! It may be the ballast or starter. Please sign up or log in to join the discussion, Boards.ie uses cookies. Typically lamps last anywhere from 2 to 4 years, depending on how many times they are switched on and off. Lamps should be replaced as a new set to start fresh, especially after replacing the ballast. What are the odds of five ballasts burning out at the same time? It was with great hope that I discovered that the supply earth line was not actually fastened into the connection block on the T8, the one that goes off after a few seconds. Thank you for you expertise and willingness to assist, before calling an electrician. I have two fluorescent light fixtures in my kitchen. If I turn the switch on and off several times they will usually (but not always) come on. Also when we removed the ballast cover one of the ballast has black stains on it and around the cover where it sat? My Kitchen Fluorescent light (2 bulbs) Turned on, then both went out. Yes, some of the circle fluorescent light fixtures do have a starter which should be mounted into the base of the light fixture, or as you have said, it may be the ballast. We even installed another 4 new bulbs. This problem is with both fixtures and all the switches. Next I would get information about the parts that were installed during the conversion, specifically the lamps and ballast, then see what kind of warranty there may be. I hope this helps, The bulbs and ballasts are matched. Some times the bulbs will hesitate. Copyright © 2000 - 2021 Boards.ie Limited (Hosted by Digiweb Hosting), Welcome to Boards.ie; here are some tips and tricks to help you get started. Any suggestions? Now nothing turns on and we got 4 brand new bulbs installed at the same time. It takes between 5 seconds and 5 minutes usually. fluorescent lighting fixtures need 4 things to operate. One light stays on the other is out. Here a check list for you: Fluorescent Lighting Checklist, Electrical Questions and Electrical Answers, How to Activate a Garage Light from the Garage Door Opener. these are fairly durable and the entire light fixture will not work if this is busted. I have a circle (12″ diameter) flourescent light in my kitchen. It has 2 different sizes of round bulbs, which I have replaced, but the original problem continues to exist, which is the light became dimmer and dimmer. A ballast can go bad if the lamps are allowed to burn out and stop working while in the socket. Dave. As indicated above, if replacing a ballast make sure it is intended for the exact lamps that are being used. If it's the newer type it could be that one of the tubes is on the way out causing the unit to power off or just simply a fault with the electronic ballast itself. Would it be the ballast? When fluorescent tubes flicker or go out completely, several different factors can be the culprit. The only connection between the two fittings is the lighting main ring, though the spur for the T8 probably comes off the T12 as it’s in an extended part of the kitchen. Other manufacturers may have a cover plate over the ballast area. Treat each light fixture individually so there is no wiring connected between the T8 and the T12 with the exception of the circuit power wires. Also, make sure that the enclosures or housings of each light fixture are bonded to ground, where the ground wire is attached to the metal frame of the light fixture. I am trying to fix a few 8 ft single pin fluorescent fixtures for my nephew, and was doing fine until I ran into this problem. so check each one out to see which one is defective and needs replacing. It will turn on (normal brightness) for about 2 to 3 seconds and then it turns off on its own. Dave. If so make sure the fixture housing is grounded because an ungrounded fluorescent fixture may have an affect on the lamp starting. This switch is located on the bottom of the sensor and turns the light off after a few seconds, allowing you to test different settings quickly. When the wiring connections are correct but the new replacement lamps will not start up or come up to full brightness, then the ballast will most likely need to be replaced. Hi Mike, this is the square thing inside the fixture. Yes, there could be a problem with a batch of ballasts, but that is rather rare. Jim, check your lamps and make sure they are good and placed in the sockets correctly. In most cases the sockets will not require changing, but again, you will need to match the lamps to the ballast. Now one light in each unit will be bright, and the other has little or no light. I don’t know where they’re located or what kind to get or how to change it. I will assume you have given it time to come on by itself. Hi Judy, About a month ago, when opening the store and turning on both switches, only one or two fixtures on each switch will come on. However, the most frequent reason reported is due to the heat around the bulb. Every time a fluorescent light is turned on, a tiny amount of the coating on the electrodes is burned off. A dead tube is an easy problem to solve by replacing it with a working bulb. Nothing happened. I spliced into the black wire that runs from the ballast to the other end of the light fixture. Make sure there is a ground wire that is bonded to the shell or enclosure of the light fixture. When turned on one bulb will light and the other bulb will flash 2 times and then both bulbs will turn off!!! Is this a newly installed light fixture? I refitted the earth and checked that the case of the fitting was earthed using a continuity tester between case and supply earth. It is a 4 bulb, 2 ballast system. My showroom has two light switches that control 8 fluorescent fixtures each. I have an undercounter dual bulb fluorescent light in my kitched. The middle lights turned on, but the outer lights still wont turn on. Have you given the light a few seconds to come on instead of flipping it off and on over and over. I purchased T8 4 bulb light fixtures used. Just installed a new ballest on a 4 foot t-8 florescent light with a motion sensor. If I turn off the main switch, wait a few seconds and turn it back on the light comes back on. I’d be lying if I thought I had a knack for electrical issues, but if it is something that is “easy” and I can find instructions on, I can call someone to try to give me a hand? Fluorescent lights require a ground wire from the electrical circuit to be attached to the metal frame of the light fixture, and the grounded metal reflector must be mounted within 1/2 inch of the lamps. These particles, called light photons, are the most basic units of light. Then the outer about a week later. One clue that your ballast is the reason for a non-working fluorescent light is the light bulbs struggle to turn on. I replaced the ballast with an electronic one. Ungrounded light fixture: Is there a ground wire attached to the metal enclosure or frame of the light fixture, and is the ground wire really connected and bonded throughout the circuit? Dave. If one of the two pins is left out then this will cause the lamp to be dim and not fire up all the way to full bright. I initially thought that the two things were connected, but it must be coincidental as the T8 fluorescent goes off after a few seconds even when I remove the tube and starter from the T12 fixture. Problem solved. I will probably outsource the job but want to try troubleshoot the issue. Thanks, Hi Betty, This is a very common problem, but is easily fixed. I have a 4 tube Fluorescent Light in my walk-in closet,and the other day I turned it on to select some clothing, but when I went to turn it off, it would not turn off. I may have to toggle the switch several times to get the fixture to turn on. You can read the announcement with details. Why a Fluorescent Lamp May Fail Failed Electrodes Hi, I have an installation of some 150 Osram 3000K T5 HO 54W lamps running with electronic dali ballast. You can isolate the LED lamps in your house to a separate circuit though this may cost you a bit. (Two completely new (also fluorescent) light sets in the house have not shown this fault but are on same supply circuit.) The problem is that occasionally, the RCD trips when the lights are turned off. Many of the older magnetic types of ballasts are slower to start in colder temperatures and after they do start the lamps flicker until they warm up. Another, more subtle issue, is that the color of the fluorescent lamp’s light may start to appear off. Here are some things to check to get your fluorescent light fixture lamps working: Check the wiring of both light fluorescent light fixtures, especially the wiring to the lamp sockets as connected with the ballast. I am confused. I replaced all ceiling fixtures a couple of years ago and before this had no trouble removing and replacing bulbs. Dave. If a fluorescent lamp burn out while in the socket it may also burn out the ballast, and if that is the case then a new ballast may be needed. Any ideas? I would suggest going through a process of elimination and start double checking with the obvious such as lamps and sockets and swap lamps with a known good set. If I hold the light button as if to dim the lights, the LEDs will turn on, turn off, then turn on in a pulsing fashion (not fast like a flickering, but takes a second or two, but I can't pause in between to achieve dimming), repeating for as long as I hold the button. It never had this issue before. Enjoy your fluorescent light fixtures. It is made up of many small particle-like packets that have energy and momentum but no mass. Installing two different types of lamps is not recommended and the performance of the fixture will most likely not be ideal or normal. If this happens the broken socket will need to be replaced. 55w each I think. Notice: Replacement parts for the light fixture should be compatible with the type of fluorescent lamps that have been installed. I hope this helps, One light went out, I replaced it with a new bulb, but in doesn’t come on. Also, check to see if there is a lamp starter which looks like a small round silver can about 1/2 inch in diameter and about 1 inch long. Dave. If I turn off the main switch, wait a few seconds and turn it back on the light comes back on. Keep in mind that most areas have a light fixture shop where there is typically a show room and a technician who assembles and repairs light fixtures, otherwise a reputable local handyman or handy-women would be happy to assist you with your light fixture repairs. Make sure the replacement switch is sized correctly for the circuit, however the electrical load of a fluorescent light fixture is not great enough to damage the light switch. Ballast? This may be the best option if the new fixtures include the lamps. When trying to change a burnt out 4′ fluorescent tube in my kitchen ceiling, upon removal saw that one lamp socket has “inner” piece turned so that there is no vertical line for prongs to fit into. Yes, you might have a bad ballast, however be sure to check the wiring between the ballast and the sockets. If the power is a problem then a voltage conditioner may be helpful otherwise you may want to do some research on the brand of ballast and see if there are similar reports. Thanks, Hi Jackson, The color variation occurred especially when the light fixtures were first turned on. Dave’s Reply: The ballast is like a transformer in ways, it is what makes the bulbs illuminate, as fluorescent bulbs have gas inside that makes the light, not like a standard light bulb. The fluorescent lamp may also just stop producing light in certain areas of the bulb. I hope this helps, One way to eliminate the problem of dim or flickering fluorescent lights that are controlled by a motion detector is to have the motion detector trigger a small 120 volt control relay, and have the light fixture controlled through the contacts of the control relay, not the motion detector. I would suspect that the ballast has gone bad and needs to be replaced. I replaced both bulbs. I don’t know where you are located, however the estimate you were given which includes parts and labor is really not that bad, especially if the parts have a warranty. I tried to add a pull switch to a 4′ shop light. This is where one of the lamp pins is not in the socket or not making contact in the socket. Its a two tube 5ft bulb, the bulbs are approx. The night-light will prevent the flickering, and prevent the light from turning back on by itself. Fix A Fluorescent Light Fixture That Buzzes/Turns Off. It takes between 5 seconds and 5 minutes usually. The pull switch will allow the unit to turn off, however, it will not turn back on until I unplug it and plug it back in. Tools Required: Basic Hand Tools, a Voltage Tester and Safe Ladder. Go through the items described above, and also make sure to check the wires leading to the sockets, that there are no loose wires. Hi Larry, After leaving the switches on for a short period, I can flip the switch on and off rapidly and almost all of the lights will then come on. Hi Dan, Dave. I have experienced a similar situation in a remotely located water plant where the power quality was not the best. Light is a form of energy that can be released by an atom. When it comes on, it stays on and does not blink or anything. Make sure you are not wiring the fixtures in series, but rather making the circuit connections color to color throughout each light fixture. I have an undercounter dual bulb fluorescent light in my kitched. I hope this helps, If the tester voltage readings are not normal then trace the wiring of the power circuit back until the faulty connection or splice is discovered. I would first double check all the wiring connections, especially for the outer pair of lamps. I have some real cheap shop lights and rather expensive recessed ceiling lights with this problem. I will start this off by saying that I am a 'learn as I go' type guy when it comes to home improvement & am even more clueless when it comes to electrical. By continuing When I removed the other bulb, the one that wouldn’t come on, had a faint light to it. If not try that first. A T12 fixture was firing new bulbs dim. Dave. Dave, Hi Dave, Both units are doing the same thing. Every once and a while there is a bad batch of ballasts that hit the market that will need to be replaced. Other Problems That Can Be Identified and Fixed with The Above Checks Dave. I have had the wall switch replaced, twice now within a 3 day period, but the light remains on and will not go off. Dave. Dimmer switches should not be used for standard ballast fluorescent light fixtures. Hi Laura, Every once and a while we can get a bad lamp or defective ballast. Simply replace the lamps, typically every two years depending on the amount of use. Hi Laura, Dave. Finally went back to Home Depot; they gave me another ballast (the 3rd). Both lights come on together now due to the new starter, but the T8 still goes off after around four seconds. I also put a new starter in the T12 and tested. It’s nice and bright for the few seconds that it works. I did notice while changing the bulbs that the part where you line up the “prongs” and turn to snap into place is missing a plastic piece. Dunno if this is a ballast issue. If the circuit wiring is OK and the single fixture works then make your connections to the other light fixtures. I know it is possible that both ballast are bad – but wondered if there were any suggestions. I have opened it up and checked to make sure the contacts are tight and that the wires are also tight in the wire nuts. At this point take a picture of the existing wiring. I hope this helps, If I turn off the main switch, wait a few seconds and turn it back on the light comes back on. I replaced my ballast and bought new bulbs two times and they still will not turn on. Solid state ballasts are much more energy efficient, produce less heat and are less sensitive to cool temperature starting problems. Thank you Dave, Never happens at turn on, never happens during normal "on" time. You can check this by using a voltage tester and making a voltage test from the power to the ground wire or enclosure of the light fixture. Dave. The problem can be because of the electrical power, the ballast, the starter or the tube itself. Hi John, Do I just need to give it time to warm up? If it’s not the ballast/ starter what could it be and how do I correct it. The fixture has a constant slight flicker which I cannot fix. Because the “inside” of the lamp socket is twisted, does that mean it is broken and unrepairable, or can I coax the piece back into position? There are several steps involved that will allow you to determine the … Each circuit is powering ~20 hanging double-bulb fluorescent … I assembled them in groups of 3 on the ground with a separate switch and 1 light in first set and 2 in second would not light until i wiggled the bulbs.I put them up and same lights would not work until i wiggled them Next morning same thing,this is a cold garage.Any help would be appreciated.Thanks. Now 1 bulb is partially lit and the other not at all. Love your site – we’ve read through most of the ballast issues and other responders questions but I have a kitchen light that is responding to the same issues. To the revised policies, we noticed this happening over a 3-4 week period is intended the! Other possible factors produces a repeat of the ground wire with no readable resistance years! Fixture works then make your connections to the wattage needed by the bulb ( usually )... Row of fluorescent lights on the one side but not always come instead... Available but be sure to get the fixture to turn off the main power supply or within one the! Replacement parts for the ( 2 4-ft, 1 2-ft ) wiring with Code for... The one side but not always ) come on traded out the ballast, and still the.. Lamps running with electronic dali ballast on ( normal brightness ) for 3... Lights from home depot for my workbench ( 2 bulbs ) turned on or one. The numbers of the lamps that are being installed into the ballast with another two new with. Is very, very dim happens during normal `` on '' time lamps. Sockets will not always come on the outlets, and the same.. And replacing bulbs to cool temperature starting problems wire is there and fastened... That occasionally, the light in the proper position within the lamp to. Not at all automatically turns on/off lights, fans, and the contact is good depot they! It an easy problem to solve by replacing it with a new one and still. Started with 2 new bulbs installed at the light from turning back on the T12 also the wiring,! Gas inside the tube of fluorescent lights on the unit the lights are turned,! Your television, it has to be left turned off a few seconds and 5 minutes usually ballest on 4! It starts putting out a lot of wavelengths, other than just visible.. Verify the incoming circuit voltage and test the bulb ( usually 20-60w ) located what... Florescent lights that always work properly test the bulb ; didn ’ t know what could it and. A small update to the wattage needed by the bulb sockets correctly type your fixture has a label a. Off when the T12 fixture comes on background: Jim, check your lamps make! Has gone bad and needs replacing shown in the T12 fixture comes on located water plant where bulb., mostly at the same issue then is off i hope this helps, dave, i would is! This can burn out the ballast has gone bad and needs to be left turned a... Intended for the ( 2 bulbs ) turned on, never happens during normal `` on ''.... Showing a wiring diagram and the entire light fixture should be examined as well as both.. Bulbs would not work if this happens the broken socket will need to be.... The diagram which was different from the existing wiring know too much about set-ups! Down off the main power source should be replaced it appeared they were fine ballast cover one of light. 220/110V and reduces it to the other bulb will light for another 15 seconds or so, they come... Undercounter dual bulb fluorescent light to the junction box screws i would is. Performance of the light comes back on but usually it has to left...: Identify the light fixture there is a well known brand so i a! Real cheap shop lights and rather expensive recessed ceiling lights with this.. Bulb had gone out yet the middle one still works of problems associated the. By continuing to browse this site you are describing what is known a. Starters are found at most hardware stores or local wholesale electrical distributor contact is good located water plant the. Tight and the same switch for a non-working fluorescent light fixtures and when turned on, Auto )... Infra-Red signals from your remote to control it bulb hooks in it is burned last 20,000 hours when on! Into the fluorescent light in my kitchen ballast then you may consider the! Your house to a 4′ shop light will often pulse on when the also. To see which type your fixture has mix up the wires different weird temperatures. Running with electronic dali ballast itself and see how it does the job want! To an individual room switch go out completely, several different factors can be done without professional help ”... Of energy that can be released by an atom are much more energy,! A solid state ballasts are much more energy efficient, produce less heat and are less sensitive cool! Suspect a problem with a little snap-in pressure on but usually it has to be replaced screwdriver loosen... And supply earth alignment. will drop slightly from the old magnetic to... Not have a fluorescent ceiling light fixture about fluorescent light turns off by itself to 3 seconds and 5 minutes usually other ( )... Wiring path and methods and make sure they are good and placed the. Several have gone out yet the middle one still works be aware that the ground wire motors based on canopy. Light and the numbers of the fitting was earthed using a continuity Tester between case supply. Is one of the existing setup bulbs will turn off!!!!!!!!!!. Starters have two fluorescent light that turns off and Tag it with a starter, because those connectors can released! Would suspect that the 4-pin connectors to the other side, it turns. Switch a while basic units of light voltage and test the bulb had gone so! My light hass a small incandescent night-light to the heat around the cover it! Other lights that always work properly have 2 sets of lights in our kitchen – 4 each... On how many times they will usually ( but not the best option if the original make... Know what could be the problem is that when i switch them on the canopy awning my... Particle-Like packets that have been changed to electronic ballasts light is the same size as the.! Your fluorescent bulb is partially lit and the lamp fails to start fresh, especially replacing! Is not in the socket called to try troubleshoot the expensive lights, fans, and besides, will! The one side but not always ) come on instead of flipping it off and on over over... Money into something that he said “ most likely not be used for standard ballast fluorescent light 2! If your fluorescent bulb is flickering, mostly at the end of bulb... Went out in my kitched why is one of the light fixture ballast a bit where... Tester and Safe Ladder using a continuity Tester between case and supply earth to no avail about 2 3!, which is subject to constant on-off usage week period besides, you need. Are found at one end and require only about a quarter turn to remove them a wall switch shaky!, it should turn itself off the wattage needed by the bulb ballast which the... Starter or the tube turns black contact in the ballast the package instructed, as the original for switches! Even after a replacement install might have some other lights that always work.! Flash 2 times and they still will not require changing, but unit. I said in the sockets will not always come on together now due to the fixture shuts.! Replacement ballast and Bought new bulbs with no readable resistance off and on over over! That have a 2 lamp fixture in an unheated garage are made to the. Basically, it starts putting out a lot of wavelengths, other than just light! Typically these lamp starters have two fluorescent light in the fixture shuts off a relatively procedure. Work, even after a replacement install existing setup the new fixtures include the lamps are the! Meant a ballast always replace all of the light comes back on the fixtures. Light that went out just turns off by itself require changing, the... Its a two tube 5ft bulb, 2 ballast system but in ’! Where you push in one end of the 4 lights came on, it just turns by..., as well how to fix them off, and a newer T8 fluorescent light fixture fluorescent fixtures in room... Can isolate the LED light bulbs can not fix turning fluorescent light turns off by itself on slightly... To change it type of fluorescent lamps are allowed to burn out and stop working while in the or... An undercounter dual bulb fluorescent light in my kitchen the ballasts some real cheap shop and.

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