ok i have 5 little seedlins all about 1 inch tall and they are about to have there second set of leaves. i have them about 2 feet under a 250 watt metal halide bulb. i have two questions. 1. when will i be able to top them 2. how long should i wait before i put my light 12-14 inches from them?
Top them at about the third node. Start moving the light lower now; a few inches every 24 hours and keep a fan and an eye on them.