How much light

[Master Jedi]

Hi guys, it's me again. I live in Montana where the Temps on my windowsill started climbing way past 90°, so I moved my babies
(Dendrobiums and phalaenopsis) into an air-conditioned grow tent with a mars hydro Tsw2000 led light over them, but I'm unsure how much light they should receive. I measure my light in ppfd or lux. Can anyone help me out?

[Mugsie]

Tough answer. Phals and dents are at opposite ends of the spectrum. Phals prefer low light, light shade, while dents like high light dappled sun. Maybe you can shade the phals under the dents somehow? Best of luck.

[Master Jedi]

I just thought the dendrobium could handle more light

[estación seca]

There are many different Dendrobiums from many different climates and environments. Which one do you have?

Phals. do best with just under 11,000 lux most of the year. A bump to 13,000 lux for 6 weeks in Fall, then back to 11,000, may help initiate flowering.

[greyblackfish]

Just wondering what way past 90F is. Because all my hard caned hybrids mature and young dens alike are sitting outside where the highs are 95-100 and nights are 75. I have moved them inside on days past 100 tho. The only one I keep inside where it’s cooler is my den chrysotoxum. Still not sure about that one.

And by babies, do you mean seedlings?

[estación seca]

Over 100 F / 38C might be fine with high humidity, but might be a big problem with low humidity. It sure is here.

[greyblackfish]

Oh I see. My dendrobiums do quite well here probably because the humidity levels are good. Just wondering, what are the symptoms of a dendrobium in high heat and low humidity do? Does it look like sunburn?

[estación seca]

When there's high heat and low humidity, transpiration increases. If the roots can't take up enough water, leaves get dry, wrinkled, then die. New growths turn brown or black and die. Pseudobulbs shrivel, and can also die back.

[greyblackfish]

That’s probably why the growth on my chrysotoxum leaked a lot of sap and shriveled last year. What was left still put out a new growth but most of the cane is finished. Good to know.

[Master Jedi]

Sorry didn't mean to repost that. Separated the dens and phals with cardboard. It seems to work. Thank you guys for the advice. It helped a lot. Not in the greatest od health so I'm making lots of mistakes. Sorry for that. Thank God for my wife's help with all of these plants. We have over a hundred different types and it's a lot of work.