how long do i keep my grow lights on when i sow my seeds?

Lansing, IL

just starting out and i have not been able to find anything to helpme with how long or how often i should keep my lights on when i first sow my seeds.

Lewisville, MN(Zone 4a)

Here's answer to all your questions.
http://davesgarden.com/community/forums/t/371007/

Danville, IN(Zone 5b)

I turn my lights on first thing in the morning and off when I go to bed.

Clover, SC

12-16 hours is a good rule of thumb. Don't leave them on 24 hours a day ... they need darkness too!
http://www.tomatodirt.com/growing-indoor-tomatoes-faqs.html

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