My 2 cents: As for CFL lights you want to put them as close to the plant as possible! They produce very week par (Photosynthetic Active Radiation) which plants needs in abundance and in different spectrums.
Here’s a typical spectrum a 6500k cfl produces:
About 2 inches is usually the closest you can get em before it starts to hurt the plant! If you are unsure hold your hand up to the light at the distance your plant was! If it’s hot ur too close if not your good to go! The bad thing about them being only 2 inches is if u don’t watch them they will try and commit suicide by growing into the light and burning up. Lol
Here some pics of my VFT grown under a 6500k 1600 Lumen CFL at about 4 inches away from the plant!
Before/ when I first got the VFT:
After about 3 to 4 weeks gone by:
As for the mars-hydro 300w LED, ya you can lower it if u want! Because it only produces about 445 par at the very center at a height of 18”! The sun produces about 2000 par.
I only say that because from what I was told vft’s can withstand full sun but they don’t like the full mid day sun which the 2000 par reading was supposedly taken. So I’m not really sure!
*Note:
I’m not sure of the par requirements of a vft
*Note:
I’m not entirely sure if the 2000 par reading is right, since I haven’t personally tested daylight with a par meter, most likely it’s higher!
Here’s a pic of the marshydro 300w par spread
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