Trowe
New member
- Location
- Malden Mo.
i replaced 4 light fixtures with new 4t fixtures like what was previously there, and the new fixtures failed within a couple hours
new 4t 4 light ballast failure
- Thread starter Trowe
- Start date
- Status
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Sorry to hear. Is there a question you are wishing to ask the group?
mopowr steve
Senior Member
- Location
- NW Ohio
- Occupation
- Electrical contractor
Explain what a 4t fixture is, never heard of that.
T12,T10,T8,T5 sounds more familiar.
T12,T10,T8,T5 sounds more familiar.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Without any more information it sure sounds like a voltage mismatch.
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mopowr steve
Senior Member
- Location
- NW Ohio
- Occupation
- Electrical contractor
Agree, unless the fixtures are in a high heat area or he is not aware of some kind of automation (motion sense switch, power management system, etc)
- Location
- Massachusetts
JFletcher
Senior Member
- Location
- Williamsburg, VA
Welcome. Failed how, exactly? One by one, simultaneously? Are there other lights on the circuit? Do they work? What model/part # are your lights?
Could be a voltage mismatch, could be an open circuit, could be a lot of things. You're going to have to do some more troubleshooting before we can offer anything more than a shot in the dark, so to speak.
Could be a voltage mismatch, could be an open circuit, could be a lot of things. You're going to have to do some more troubleshooting before we can offer anything more than a shot in the dark, so to speak.
Electric-Light
Senior Member
Multiple fixtures failing within a few hours sounds like a combination of low spec design and misapplication.
277v into 120v only ballast is usually instant failure. 347 into 277 could be a cause for failure after a few hours depending on design margin.
Please respond with:
The general type and specs of the new fixtures, such as the voltage rating, lamp technology type.
facility type and fixture voltage. -> Consumer grade LED type fixtures are often designed to minimize unit cost over anything else and they may not withstand dirty power. Dirty power is not necessarily a bad thing. It's often a design failure of not being appropriately tough for the intended use.
Controls/switch type. Timed/electronic switch only meant to work with incandescent/mag ballast can cause mutual destruction when used with electronic ballasts.
277v into 120v only ballast is usually instant failure. 347 into 277 could be a cause for failure after a few hours depending on design margin.
Please respond with:
The general type and specs of the new fixtures, such as the voltage rating, lamp technology type.
facility type and fixture voltage. -> Consumer grade LED type fixtures are often designed to minimize unit cost over anything else and they may not withstand dirty power. Dirty power is not necessarily a bad thing. It's often a design failure of not being appropriately tough for the intended use.
Controls/switch type. Timed/electronic switch only meant to work with incandescent/mag ballast can cause mutual destruction when used with electronic ballasts.
Last edited:
kwired
Electron manager
- Location
- NE Nebraska
Maybe a typo and meant 4 ft, 4 lamp fixture?
jhawkbb
Member
- Location
- Lawrence, Ks Rock Chalk
What brand were the fixtures? We recently installed 12 HE Williams 8ft 2 lamp T8 fixtures, one of which had a bad ballast from the start. While we were working on the second row, another went out so we replaced it too. Had a call back the next day saying 3 more fixtures were not working. So that was 5 of 12 and we decided to replace all the ballast figuring they were a bad batch. Not a problem since. I would definitely check voltage and all that first but it could be something like we ran into.
kwired
Electron manager
- Location
- NE Nebraska
Problem there wasn't exactly HE Williams problem but rather whichever ballast manufacturer they used in that particular run of product.
- Status