@HeyJude, I grew with HPS for several years before switching to a LED to make it easier to manage temperatures. Keeping my LED 10 cm from my young plants would totally bleach, fry and stunt them. In bloom, the optimal distance is 35cm from the canopy and 60-65cm for veg starter plants. Ive been growing and dialing in this light for a year and a half and I dont think any LED manufacturer would recommend those distances.... The humidity is on the low side because I have flowering plants aswell. Thanks for your input.
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