lights or no lights while waiting for the sprout?

After the seeds crack and u put em in w/e u decide to put them in. I've seen people put lights on them, and I've seen people put them in a dark place until they sprout from the soil/rockwool , etc.

What do you guys think is best to do? Wait til they sprout? or put light on them even before they sprout up?

I've always left the light on. as soon as the taproot came out of the shell i had lights on.
Either way doesn't really make a difference. Some people leave the lights on 24 hours a day (like me).
Some people do 12/12 - it is apparently suppose to help with sexing - but i don't know if i would believe that or not..
Others wait until a sprout has made it through the medium to the open air to turn the lights on.

I think it really just comes down to preference.

Without light whats the sprout gonna grow towards?

24 hr for seedlings, some prefer 18/6 but I only use 18/6 for veg

Never give seedlings intense light though, I usually use 4ft fluorescent tubes, over a foot over the seedlings. Just until they develop their second set of leaves.