Here's another picture...its the ONE leaf actually...

Its reddish...rust looking? Definitely reddish brown....

Perhaps if you tell the real orchid growers in the frozen north some more details of your lighting you might get an answer.

Wattage of Led

Distance from leaf

Hours of light.

Plant looks in excellent condition apart from the discoloured area.

Oh!!! Sorry. It's a 6400k LED.The light is suspended 6inches above the plant. IT gets morning sun for 3hrs ( medium shadow by hand test) and afternoon sun 1hr... ( intensity of...um...dark shadow by hand test at this hr). Supplemental light on for about 9hrs.

I'm sorry I omited those details. Did I post in the wrong forum?

It is the correct forum. It is just that Orchid growers live in widely different climates.

Knowledge of under lights culture here or somewhere like Southern California is just about nil.

I'd say the Led is too close but that is a guess. I'm sure that you will get a good answer.

You found us. Where the heck is 2u? I live in 10b. We don't use lights this far south. But I'll guess it is the lights. Less time or less distance or both. But get more opinions as my challenge is the sun.

Ohio.

Zone 6.

Wowza! Am entirely new to the forum and didn't realize the protocol....

Well...thanks for helping!☺

There is no protocol! Just orchid growers. Most people here are helpful.

SM should apologise seeing you told everyone in post 1 where you live.

Ill raise the light higher.... May be that. Nothing under the leaf...just that reddish area on top. Ahhh lots to learn. Am excited though! Been quite an interesting time in my life so am happy about a hobby...at last.

There! Moved light up about 12 inches off plant ( though its about 4 inches from the flower bud now...) and the phal below it ( in bud too) is further away from LED now too but gets more light from the window in the daytime anyway.

Hope this set up works!

Personally, I'd ditch the light altogether and just open the blinds/curtains and see how you do.

I'd say it is a burn from being too close to the LED light. Paphs and phals don't need a lot of light, but an eastern exposure in Ohio right now is pretty low light. That said, I'd move it to the bottom shelf with the phal. The Twinkle might like the top shelf.

Bob

I doubt it is too much light, most Phal's get a kind purple tint exposed to high light levels. My guess is that the potting medium is at its end and the plant has problems with its root system, When the flowers are done I should repot the plant .

Yes addition lighting, I think when keeping the plants inside the latitude where we live is more important than the climate zone. Here in Holland 52N latitude I have only 6-7 hours of usable light on a bright day, a rainy day will be much worse so I use DIY LED lights to help my plant through the winter.

A good alternative too a LED spotlight are LED 2 foot TL my favorite combination is one warm and one cool white total 20 Watt

Very easy to use need no ballast just connect to the main, on the picture my two lamp setup the other lamp is at the back..

Later I start to build my own lights with the new full spectrum LED chips available from 3w to 100w. I use the 3 and 10 watt types.

Oh man! Awesome tips! Thank you so very much!

As I recently (less than 4wks ago) got ths plants..I will defintely re pot as soon as its bud opens up and drops! Yes...the light is rather low most days here and the twinkle oncidium is quite happy under its LEDs☺...you were right!

Ha! I won't attempt building light fixtures. May burn our house down!