Quick lighting question

Can you go 24/0 on seedlings for two weeks and then switch to 20/4 once they're transferred to hydro for the rest of veg? Especially if you're fighting heat issues?
 
They were under a 24w T5 for 10 days 24/0 and that was my plan for veg. Not sure why....I think I read it in the grow bible. Now i've got heat issues and res temp issues. Not bad, but wanted to get on top of that.
 
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