My last crop showed some leaf burn in the early stages of veg. I use two HLG’s over a 2 sq meter functional grow area. !0 plants per grow. Can anyone specify height above tallest/lowest plants canopy and what intensity for the lights.

@dbrn32 @Underthestairs these guys may be able to help with that friend

You can download the free app Photone on phone. Great app to let you know DLI and PPFD numbers. Then dim or raise light when necessary.

What beachglass said. Just bought an hlg 350r, set it on full power, and within 2 days started getting foxtails. I spent all morning this morning reading about ppfd, and dli. Been growing for years with various lights. I had no idea. DLI is supposed to be between 40 and 60, and I was over 100. Ppfd …

Fellow grower. TY. Taking your advice for a ride.

[image] Start using DLI Lighting Daily Light Interval (DLI) is a quick and efficient way to calculate how much light our plants are receiving within a 24hr period, allowing for easy light adjustments. DLI will help you and the community to better understand your lighting i…

Mine is about 15”, but I dialed the dimmer back to the 280w setting to get those dli, and ppfd numbers they recommend. [image] [image]

All plants are different. There is no set in stone set of specs to answer your question in reality. In my 3’ x 3’ tent I have two HLG 260 Rspec lights with a UVA-30 light between them. So it’s basically a 550 Rspec with UVA. With a real Apogee PPFD meter. I was up to 870 PPFD but tent temps starting…

HLG 550 light settings

Indoor Growing Lighting

Underthestairs April 17, 2022, 5:54pm 6

Also depends on the light because some LEDs can be run closer than others. HLG are great lights. I have Diablo boards, they say I can get shit 15" from canopy.

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HLG 550 light settings

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