its hard to quantify, the back of the hand test is a good rule of thumb. 2 to 3 weeks old for 18 inches Anything over 18 inches away with my 600 hps is too far for my liking.
Try not to fuss too much. Let them grow to the light........test with your hand then move the lamp away.
Then wait 3 or 4 days then move the lamp again. I have a chain onto a hook on a roof beam so its easy for me.
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