T8-T12 lights

brandond(6)March 20, 2010

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

Thank you for reporting this comment. Undo

Check the ballast for recommended wattages.

    Bookmark   March 22, 2010 at 8:23AM
Thank you for reporting this comment. Undo

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.

    Bookmark   March 22, 2010 at 9:52AM
Thank you for reporting this comment. Undo
taz6122(N.W. AR.6b)

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.

    Bookmark   March 23, 2010 at 9:21PM
Sign Up to comment
More Discussions
Seed Starting Lights at night?
In my area (Nova Scotia) I have time of day metering...
My indoor garden setup - any improvements?
This is my proposed setup for my indoor garden. I'm...
Need help Drip watering Basil inside
So i have a little closet grow room setup with lights,...
Timers that reduce and increase lighting to simulate seasons
I was talking to MesaGardens today and he mentioned...
Correcting Lighting Later?
Hello, I am germinating Palmer amaranth for an experiment...
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™