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8 votes
Accepted

Retrofit Fluorescent Tube Fixture with LED Tubes

It's not going to work with these. I do a lot of fluorescent conversions - mostly from T12 to T8 since I like real fluorescent. I recognize those particular fixtures, with the molded-in tombstones and ...
Harper - Reinstate Monica's user avatar
7 votes
Accepted

Removing and Replacing Flourescent Ballast

The center section of the fixture hides the ballast and the anchoring. Squeeze it together at the tabs to release it along one side and it will come out. Reinstallation is obviously, the opposite. As ...
RMDman's user avatar
  • 32k
6 votes

Can a T8 bulb work with a T5 ballast?

It won't work right. It will overdrive the tube (or underdrive the tube) and you'd get short tube life. It may flicker horribly. It may not be able to strike. Basically the same things that ...
Harper - Reinstate Monica's user avatar
6 votes

Is it safe to use a 32W LED bulb in a ballast with a max bulb wattage rating of 32W?

First let's correct a misconception. Consider a normal screw-in Edison bulb that is 800 lumens. 800 what??? Exactly. What we care about is the brightness, which is 800 lumens. But for historical ...
Harper - Reinstate Monica's user avatar
5 votes

Is a ballast required, or merely acceptable, for this Philips InstantFit LED tube?

I can confirm Phillips InstantFit work with ONLY specific ballasts and do not work without ballasts. I tried with Utilitech lights and with ballast removed to no avail. I'm done with fluorescent ...
Bret's user avatar
  • 51
5 votes
Accepted

Is a ballast required, or merely acceptable, for this Philips InstantFit LED tube?

Interesting thing about being human is the brain is wired to see what it expects to see. It's hard to turn that off, even if you're a ship spotter or pilot. There is such a thing as LED bars which ...
Harper - Reinstate Monica's user avatar
5 votes
Accepted

How do I choose the correct fluorescent ballast?

You identify the tube type, then the ballast. The fixture decides the tube The fixture and its lampholders are going to decide the size of tube you can use. Within that, you may have some ...
Harper - Reinstate Monica's user avatar
5 votes

T12, 4ea 4ft lamps, 2 old ballasts. It appears two of the lamps aren't coming on. Sometimes the fixture flickers

Skip "what you can find at HD/Lowes." I've looked there, it's awful, and overpriced. Relamp with T8's and a nice 4-tube electronic ballast - programmed start by preference. You'll get longer ...
Ecnerwal's user avatar
  • 220k
5 votes

T12, 4ea 4ft lamps, 2 old ballasts. It appears two of the lamps aren't coming on. Sometimes the fixture flickers

If you want to stay with real fluorescent This answer is about staying with fluorescent. I do hundreds of fluorescent upgrades. You have good prospects any way you want to go. In most cases ...
Harper - Reinstate Monica's user avatar
5 votes

T12, 4ea 4ft lamps, 2 old ballasts. It appears two of the lamps aren't coming on. Sometimes the fixture flickers

If you want to convert to LED I personally find they are more efficient, but the reliability is hit-and-miss, and the light quality isn't naturally as high - many will cheerfully sell you sub-70 CRI ...
Harper - Reinstate Monica's user avatar
5 votes

Do I need to install a junction box before installing a LED strip light fixture?

The fixture (interior part with the ballast and wiring) is a junction box. If you were planning to replace the florescent bulbs with LED florescent bulb replacements, there was no need to remove the ...
Ecnerwal's user avatar
  • 220k
5 votes

Do I need to install a junction box before installing a LED strip light fixture?

This would depend on the fixture and wiring in the ceiling, not the ballast or driver issues. In your old fixture, if you have NM cable and it has the proper connection to attach the cable to the ...
JACK's user avatar
  • 82.1k
4 votes

Can a T8 bulb work with a T5 ballast?

T5 lamps are usually 54W while T8 lamps are 32W. The ballast's job is to establish the arc then keep the lamp running at the proper level. T5 lamps are shorter so the initial arc may not work well ...
Ed Beal's user avatar
  • 103k
4 votes
Accepted

Why new 32W circular fluorescent light bulbs keeps getting blown?

It's the ballast When old magnetic ballasts go bad, that's one of the things they do. I swear, I'm about ready to stick a logbook inside every fixture because I think most of our bulb replacements ...
Harper - Reinstate Monica's user avatar
4 votes
Accepted

Ballast failure replacement

It’s completely the wrong ballast, who sold this???? Never shop there again. Wow! That ballast is an instant-start type for huge 8’ long tubes (2438.4 mm). The ballast you want is the very common ...
Harper - Reinstate Monica's user avatar
3 votes

Installing new T8 ballast

This is what happens when you walk into Home Depot and buy a bunch of random parts. Which is why I do not like Home Depot. That, and their prices are outrageous. Currently, you have a genuine ...
Harper - Reinstate Monica's user avatar
3 votes
Accepted

How can I tell whether a fluorescent ballast is T8 or T12?

The stock sizes of 4' bulb are F40T12 and F32T8. T8s are relatively new. Both make about the same light, the T8 is more efficient. So when they talk about F40, without any further commentary, and ...
Harper - Reinstate Monica's user avatar
3 votes
Accepted

HPS bulbs and ballast wattage compatibilty vs replacement technologies

1. With HPS, no for smaller bulbs on bigger ballasts. Discharge lights are current devices. They are non-linear (behave almost like a dead short) and so, must be externally current-limited. That's ...
Harper - Reinstate Monica's user avatar
3 votes
Accepted

Why do LED retrofit instructions say to leave the ballast in the fixture?

First, that fixture looks permanently hardwired. If so, you'll want to add a ballast disconnect. Code requires it, unless you argue that the fixture is now ballastless. But it's so darn convenient ...
Harper - Reinstate Monica's user avatar
3 votes
Accepted

LED bulb replacement in Dusk-Dawn Outdoor 175W light

You will need to bypass the ballast! Failing to do so will fry the LED. Corncob LEDs are always a bad idea. They are inefficient. They intentionally defeat the best characteristic of LED -- that ...
Harper - Reinstate Monica's user avatar
3 votes
Accepted

Is this type of ballast compatible with drop-in LED tubes?

From the bulk of it, it's definitely magnetic. It has a balky transformer, and will do all "that 70's Fluorescent" behavior: flicker, hum, start hard in the cold, etc. It uses the "...
Harper - Reinstate Monica's user avatar
3 votes
Accepted

Are there LED lights that can work with a fluorescent ballast?

There are multiple types of retrofit kits. Universal they can work with a ballast or be direct wire. Ballast only these lamps usually have a list of ballasts that work with the LED lamps. And direct ...
Ed Beal's user avatar
  • 103k
3 votes

How to tell if a fluorescent light gone bad or the switch

Sounds like the starter is bad. Is there a device that looks like this? If so they are available on Amazon or at your local hardware or big box store. To replace push it in and turn.
JD74's user avatar
  • 1,834
3 votes

I couldnt find this at Home Depot. What should I use to replace it?

It is a fluorescent ballast. IMO the best approach if this has failed is to replace the entire fixture with an LED one, or to replace the bulbs with LED ballast-bypass ones. Then you can just discard ...
jay613's user avatar
  • 40.3k
2 votes

Replace fluorescent bathroom light with an LED (PL26E/H/841/LED)?

The spec sheet specifies Plug and play. That means you do not replace the ballast. The opposite is "direct wire", which is where you do. If it were a direct-wire unit, it would specify which pins ...
Harper - Reinstate Monica's user avatar
2 votes
Accepted

Shock when Installing Fluorescent Bulb 50VAC between frame and GLASS of Lamp - New Ballast Installed

After scratching my head - I decided to pull the tombstones out and inspect the wiring to make sure there was no sneaky connections and also nothing out of the ordinary. The older ballasts (original ...
Ken's user avatar
  • 5,413
2 votes

Light kit ballast replacement

Ballast replacement is fairly straightforward. I still prefer fluorescent tubes because I can easily find quality fluorescent tubes in 90+ CRI (in fact Menards stocks them), and I have serious ...
Harper - Reinstate Monica's user avatar
2 votes

Can an electronic ballast be used for a G23 lamp?

The given phototherapy tube is a glow start tube with filaments. The glow starter is built into the base. Glow start tubes are usually driven with conventional magnetic ballasts. There might be also ...
kaigoneeme's user avatar
2 votes

what is the likely cause of a single fluorescent tube not working in a light fixture with a ballast that supports two tubes?

I buy most of my ballasts on ebay for a couple of bucks, they are new pulls (seller bought new fixtures and immediately converted to LED). I combine them with the newest 90+ CRI tubes ($2 each) and ...
Harper - Reinstate Monica's user avatar
2 votes

Fluorescent Lights Turning on Slowly

Fluorescent tubes have 2 pins because each end isn't just an electrode, it's also a preheating filament. This helps the arc to initially strike, with less wear-and-tear on the tube (longer tube life)....
Harper - Reinstate Monica's user avatar

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