LED Bulbs, not panels

[Weedgrodamus]

I just got a box of LED bulbs (15 watts / 100 watts, 5000 kelvins, 1500 lumens) They look superior in every way to equivalent CFL's, especially environmentally.

My query is about distance, the rule seems to be ~20" for the 300w panel, but these are far less @100w.

I am going to try various distances but I wanted some guidance or suggestions on how to proceed.

[Gordo41]

I have the same (?) lights in my tent to fill in where the LED box light is lacking. It seem that i can have the light within a few inches of the leaves with no ill effect.
but it might depend if you have a spot of flood light. Mine is a flood light in a reflector. Which help a great deal. I'm measuring 30,000 LUX at about 4" from the light.
i've thought about building a rack of thes lights to light the whole grow.
test the closeness on a plant you dont care about.
g

[steve]

CFL distance 2-10 inches (CFL.com) and LED can vary any were from 12-20 inches - have to find the "sweet spot" also use "back-of-hand test" to determine your light's distance

[Potted]

Led bulbs can burn start far and work your way in lol

[Gordo41]

I just want to show how close my 100w (17w) LED bulb in a reflector is without any ill effect.

[Weedgrodamus]

Wow that's close Gordo, I've been creeping inches per day and i'm at 10" today, is that 4"? My girls are smaller than yours (2" to 4" tall @ 3 weeks old), does that matter?

[Gordo41]

Well thats good because young plants dont need and shouldn't have very strong light, so take it slow.