When do i need to start using grow lights

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I've got my pepper seeds in a small green house with a heat mat underneath. A few seeds have already spouted and there about two inches tall. I plan on puting them in planters when there big enough. So what do i do untill then. When should i start giving them some light? I've got two 4 foot t-5 lights that i had left over from an old saltwater aquarium, would those work?
 
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