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T8-T12 lights

Posted by brandond 6 (hdavis34@hotmail.com) on
Sat, Mar 20, 10 at 7:57

I have some shop lights I bought off of craigslist for starting seeds. IM guessing they are T12 lights but not sure. I placed some sylvania T12 energy efficient bulbs in them and they work fine. They bulbs that were in the fixtre was an older GE 40watt bulb. The bulbs looked the same. I had read somewhere on here or elswhere about placing T12 bulbs in a T8 fixture and how it can shorten the life of the ballast. I could not find anywhere on the fixture where it said to use a certain type bulb or wattage bulb. I figured if the bulb works fine then I have the right one, Is this the right mentality of have I made a mistake. thanks so much


Follow-Up Postings:

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RE: T8-T12 lights

Check the ballast for recommended wattages.


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RE: T8-T12 lights

The lights are actually working fine. They take awhile to warm up and then the rippling stops. Now they are not quite as bright as the GE 40 watt bulbs but they are ok. The sylvania is 34 watt and supposedy more efficent, it just doesnt seem as bright as the 40 watt bulb. Again I dont see anywhere on the balllast where it says what type of bulb to use. I bought the fixtures used on craigslist and they already had some older 40 watt lights in them. My main question was are T8 and T12 lights completly different, as in different size bulbs.


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RE: T8-T12 lights

Yes the bulbs are different in width. T8s are approx 1". T12 are approx 1 3/8".
As stated above "Check the ballast for recommended wattages". They may only be 32w. T8s usually put out more lumens per watt. The ballast is inside the fixture.
BTW you need as much light as you can get, get rid of the 34w bulbs no matter the actual wattage. Use them in the kitchen or the garage but not on plants.


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