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Hi Ollie, All are fine. 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. There are many reasons why an LED light bulb turns itself OFF. Dave. Dave. Already exchanged one fixture which went out entirely after 3-4 uses and wouldn’t turn back on; the problem above is with the new fixture. As a fluorescent light begins to die, it starts putting out a lot of wavelengths, other than just visible light. If you allow the lamps to burn out in the sockets this can burn out the ballast. If I turn the switch on and off several times they will usually (but not always) come on. Hi Duane, Thanks for any help! See more at: How to Install Under Cabinet Lights Dave. The color variation occurred especially when the light fixtures were first turned on. When you replace a ballast always replace all of the lamps and start fresh. I assumed the bulb had gone out so I purchased a new one and am still having the same issue. Wont turn back on and have power. Hi John, Dave. I hope this helps. fluorescent lighting fixtures need 4 things to operate. Whenever the cabinet door gets closed, the fixture shuts off. AUTO mode works as an occupancy sensor (Auto ON, Auto OFF). I checked and rechecked the ends – and it appeared they were fine. I started with 2 new bulbs, and switched them out with another two new bulbs, and the same thing happens. A sudden spike can cause the LED lamp to switch OFF. The wiring up at the light fixture should be examined as well to make sure the connections are correct. Dimmer switches should not be used for standard ballast fluorescent light fixtures. I don’t know where they’re located or what kind to get or how to change it. It was the right one for the (2)F40T12 fixture. Whether my lights will work varies with atmospheric or weather conditions. It may be the ballast or starter. The housing has continuity with the ground wire with no readable resistance. To understand the causes of the blackening of the ends of fluorescent lamps, it helps to know a little about light itself. Dave. I hope this helps, Would it be the ballast? Motion detectors work best with light fixtures that have incandescent or halogen type lamps, especially if the neutral wire of the motion detector is wired through the lamps. Simply replace the lamps, typically every two years depending on the amount of use. It is a 4 bulb, 2 ballast system. I purchased another set up of bulbs thinking that might be the problem and changed all the bulbs. Dave. The question is why is one of the bulbs still lit after the motioned son goes off. Other Problems That Can Be Identified and Fixed with The Above Checks 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. I would like to know what could be the reason for such anomaly and how to fix it. Yes, there could be a problem with a batch of ballasts, but that is rather rare. In most cases the sockets will not require changing, but again, you will need to match the lamps to the ballast. Checked the wires, all seems OK. Now 1 bulb is partially lit and the other not at all. I have a fluorescent light that turns off by itself. This could be on the switch itself, at the circuit breaker panel, or in a pass-through wire connection in the wall box or ceiling box. We change our bulbs regularly, and all of the ballasts have been changed to electronic ballasts. Thank you. Appreciate your help ! Make sure you are not wiring the fixtures in series, but rather making the circuit connections color to color throughout each light fixture. Make sure there is a ground wire that is bonded to the shell or enclosure of the light fixture. Does this mean the new ballast is defective? Never happens at turn on, never happens during normal "on" time. Yes, you might have a bad ballast, however be sure to check the wiring between the ballast and the sockets. I purchased T8 4 bulb light fixtures used. Make sure that the sensor is directly facing the area you want it to “guard.” The odds of several fixture ballasts burning out at the same time are pretty slim. The ballast typically has a label showing a wiring diagram and the numbers of the lamps that are the right for the fixture. A dead tube is an easy problem to solve by replacing it with a working bulb. At this point take a picture of the existing wiring. In some cases where the ground wire has not been attached correctly, the fluorescent lamps may not light up at all, or the lamps will burn dimly, and this will cause the lamps to burn out prematurely. Estimated Time: Depends on personal experience, the light fixture and access to the light fixture. My Kitchen Fluorescent light (2 bulbs) Turned on, then both went out. Hi Joe, About a month ago, when opening the store and turning on both switches, only one or two fixtures on each switch will come on. Sometimes they all come on instantly and other times I have to work the switch a while to get them all on. If so make sure the fixture housing is grounded because an ungrounded fluorescent fixture may have an affect on the lamp starting. Hi Ray, For awhile the two inner bulbs would not work, even after a replacement install. The other wire connects to the wire that leads back to the 120 volt lead of light fixture ballast. If this happens the broken socket will need to be replaced. It is very frustrating! Joe, Dave. 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. 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. Several have gone out yet the middle one still works. In some cases a ground wire may be present but has not been connected to the ground wire of the circuit or bonded to the grounded system of the home. Switching the lamp off and then on again produces a repeat of the 2 flash and off symptom. I hope this helps, When I switch them on the T8 fixture comes on, and then goes off when the T12 fixture comes on. There is on some florescent lights that have a starter. Hi Kerrie, Find out if there is a history of problems associated with the brands. Only two screws hold the fluorescent light to the junction box. One has one switch to operate it. Boards.ie is a discussion board with a wide range of forums, including - but not limited to -, We have updated the GDPR policy and Terms of Use. Hi Dan, Dave. Why would a fluorescent light turn on/off by itself? I tried to add a pull switch to a 4′ shop light. These particles, called light photons, are the most basic units of light. Make sure that the F96T12 lamps are compatible with the new electronic ballast that you have installed, and double check the wiring connections, especially from the ballast to the lamp sockets. When I turn it on the light is very, very dim. Another telltale sign is if either end of the tube turns black. It then won't turn back on for about a minute with flicking the … I spliced into the black wire that runs from the ballast to the other end of the light fixture. Hi NJ, Guide to Fluorescent Light Fixtures and How to Fix Them. Also make sure the wires are inserted fulling into the lamp sockets, and that the pins of the lamps are fully inside the sockets. Ballast? If your fluorescent light fixture makes buzzing noises, is flickering, struggles to turn on, or does not turn on at all, the most likely problem is a faulty ballast. I also verified that the ground wire is there and securely fastened to the fixture. Thanks, 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. Thanks for your electrical wiring question Jim. Whenever the cabinet door gets closed, the fixture shuts off. I have two florescent light fixtures in my kitchen. 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. Do I just need to give it time to warm up? Dave. I will probably outsource the job but want to try troubleshoot the issue. Hi Paul, Background: Jim, a Homeowner from Southington, Connecticut. Light is a form of energy that can be released by an atom. One is an old T12 with a starter and a newer T8 fluorescent light fixture that does not have a starter. I have a two lamp 48″ Fluorescent light in my garage. The Lamps are starting to go bad: If the lamps are dark at the end then they need to be replaced, and it is best to replace the lamps in pairs. These lamp sockets are configured slightly differently. 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 replaced both bulbs. Be sure the lamp pins are fully seated into the sockets and that the light fixtures are well grounded. Make sure both pins of the lamps are fully seated into position of the light sockets, an indication on the end of the lamp will be visible when the lamp is rotated around into position. The problem can be because of the electrical power, the ballast, the starter or the tube itself. Sometimes it works fine and stays on. 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. Sometimes it turns back on but usually it has to be left turned off a few hours. 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. For Example: The earlier non-electronic magnetic type ballasts have a minimum starting temperature of between 50 to 60 degrees Fahrenheit for the T12 F40 lamps, however the newer electronic type ballasts have a minimum starting temperature of 0 degrees Fahrenheit for T8 F32 lamps. Both units are doing the same thing. Notice: Replacement parts for the light fixture should be compatible with the type of fluorescent lamps that have been installed. I am confused. My 2 yrs old 55 inch TV model UN55B800 XFXZA keeps turning off and on by itself! Make sure the replacement socket is the same size as the original. 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. We have closet light fixtures dating from 1991. Next I would only connect to one light fixture all by itself and see how it does. Thanks, Hi Betty, Typically lamps last anywhere from 2 to 4 years, depending on how many times they are switched on and off. Dave. Every once and a while we can get a bad lamp or defective ballast. Hi Larry, When the power is turned off, the bulb flashes briefly, then is off. I have a fluorescent light that turns off by itself. Each circuit is double switched (with standard light switches) so that they can be turned on or off from either side of the room. The other identical fixture fires the bulbs just fine. Precaution: Identify the light fixture circuit, turn it OFF and Tag it with a Note before working with the wiring. Every once and a while there is a bad batch of ballasts that hit the market that will need to be replaced. Double check the items mentioned in this post, especially the wiring and make sure the lamps are in the sockets properly. So, what might be wrong with the T8 fixture? Finally went back to Home Depot; they gave me another ballast (the 3rd). I have a fluorescent light that turns off by itself. Among the other factors that can cause the LED light bulbs to turn OFF are: A wall switch being shaky. The problem is that when I switch one on, it will not always come on. Replacement light fixture sockets are available but be sure to get the same one with the same mounting configuration. Enjoy Your Light Fixture! If so, you will need to replace the socket. Dave, I Bought 3 under cabinet lights from home depot for my workbench (2 4-ft, 1 2-ft). Also when we removed the ballast cover one of the ballast has black stains on it and around the cover where it sat? Testing a fluorescent tube is a relatively easy procedure that can be done without professional help. When the gas inside the tube of Fluorescent light got ionized current start flowing through the tube from one end to another. When it comes on, it stays on and does not blink or anything. 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. I have two fluorescent light fixtures in my kitchen. Other manufacturers may have a cover plate over the ballast area. The label on the electronic ballast will state which lamps are compatible. The ends are the push type, where you push in one end and then the other end is fixed. Hi Amy, Any thoughts on the possible problem? It’s nice and bright for the few seconds that it works. Could all this be just from the single socket? Hi Tony, Most full-size fluorescent lamps are rated to last 20,000 hours when left on for 3 hours every time they are turned on. Factors that may be the cause of slow starting florescent lamps: 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 replaced the ballast which fixed the problem for about 3 days. Any ideas? I’ve checked the earth on the T12 also. Hi Mike, I have had the wall switch replaced, twice now within a 3 day period, but the light remains on and will not go off. Because of the high levels of light that HO lamps produce they use more electrical current, therefore the sockets have a tendency to go bad over time, especially if the spring loaded socket becomes worn out, so be sure to check the lamp sockets. My light hass a small cylinder shaped starter made out of aluminum. I switched the bulbs and the light comes on the one side but not the other. By continuing When converting from the old magnetic ballast to the new electronic ballast it is possible to mix up the wires. Hi Warren, At first it was only when I walked past it so I thought that might have some bearing. Thank you. The middle lights turned on, but the outer lights still wont turn on. 1) ballast. 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. these are fairly durable and the entire light fixture will not work if this is busted. 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. 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. Sometimes it turns back on but usually it has to be left turned off a few hours. I changed 2 of the bulbs and 2 of the 4 lights came on. The trips are not isolated to an individual room switch. It never had this issue before. Yes, a broken lamp socket will contribute to the problem of lamps not starting up. A T12 fixture was firing new bulbs dim. We replaced both of the sockets, as the package instructed, as well as both ballast. You then plug the fluorescent light into one of the outlets, and a small incandescent night-light to the other side. Fluorescent light fixture - Bad ballast? Hi Frank, So after purchasing 8 new bulbs with no luck we turned to your site. At this point, the power can be turned back on and the bulb will light for another 15 seconds or so. The factors that affect a fluorescent light fixture are basically the lamps and the ballast but if the lamps are allowed to turn dark and burn out in the sockets then the ballast may need to be replaced. 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? (Two completely new (also fluorescent) light sets in the house have not shown this fault but are on same supply circuit.) I just purchased and installed a HO-T5 2 lamp fixture in my shop. I may have to toggle the switch several times to get the fixture to turn on. 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January 9, 2021