Have a look at this grow of white widow 11 days old all organics PIC AVALIABLE!!

[LethalPIff]

11 day old white widow sprout standing on its own bout 4 inches tall.

Perilite
Building sand
worm casings
potting soil
cow manure
mexican bat guano 8-4-1 as tea


Under 150 watt HPS lamp with reflector
bout 13 or 14 inches away from light how is it doing so far? Guano tea added today little bit at time.


Little goes a long way


https://www.420magazine.com/gallery/data/500/2546.jpg

 

[The Weed]

Recommended typical OLH distances:
Flourescentsroximimty
400w HPS: 1 foot
600w HPS: 1.5 foot
1000w HPS: 2 foot
Yes you can get closer, I copied this info from this thread,
What distance should my light be from my plants?.