Hey chief,

Seedlings that are immediately put under HPS lights can be prone to stretching, so if you see that this is happening you might consider lowering the light a little bit more, or getting those fluoros back on the plants for a little bit longer. I'm sure you've heard of testing the distance of the HPS by using the back of your hand underneath the light... if it feels too warm, back the lights up, if not, you can probably lower them some more. Personally, I like to keep CFL's on my seedlings until they just about outgrow their starter cups (2-3 nodes) before transplanting and turning on the big lights, but that's just me.

Also, I can't really tell what your flooring is made out of - I'd imagine it's not concrete if it's in a closet - but if the floor has the tendency to get cold when the lights go off, you might consider setting the containers on something that will serve as a buffer between the roots and the cold floor.

Take care. :jointsmile: