New roots or old ones that didn't get to grow?

[Roberta]

Is it just the lighting, or did that new leaf get a bit too much light? Remember, Phals are low-light plants. They benefit from more hours of light but not more intensity.

[Tolis]

It's probably getting more light than ideal. That won't last much longer though. Fall visits me sooner than the rest of the country. I'll look into finding a new, darker place to put it. I am not using any artificial lighting.

[Roberta]

Just move it away from the window. Even if the room seems uniformly bright, light is much less intense away from the source.
In fact, do consider supplemental lighting as the days grow shorter. It doesn't need to be a fancy grow light, just a full-spectrum LED. When I first got into orchids, I used my spare bedroom as a "greenhouse". It got good morning light, but after 4-5 hours the sun shifted and became very indirect, and I got very few re- blooms. I got some (really cheap) shop lights (at that time it was fluorescents, LEDs weren't available yet) on a timer, 12 hours a day, and got about 805 reblooming. The lights weren't bright, it was the duration - the extra hours- that made the difference.

[Dimples]

They really do, don’t they. I have a phal with a horrid root system that has bloomed twice in the last year and is currently growing a new leaf. It should be declining rapidly but it’s not. It’s also not growing any new roots that I can see. It’s been interesting to watch.

[Burgos]

Originally Posted by Roberta

Just move it away from the window. Even if the room seems uniformly bright, light is much less intense away from the source.
In fact, do consider supplemental lighting as the days grow shorter. It doesn't need to be a fancy grow light, just a full-spectrum LED. When I first got into orchids, I used my spare bedroom as a "greenhouse". It got good morning light, but after 4-5 hours the sun shifted and became very indirect, and I got very few re- blooms. I got some (really cheap) shop lights (at that time it was fluorescents, LEDs weren't available yet) on a timer, 12 hours a day, and got about 805 reblooming. The lights weren't bright, it was the duration - the extra hours- that made the difference.

Since you have experience on lighting, just a quick question about my east facing growing window. My plants are about 20-50 CMS away from the window and now get about 2 hours of early morning light till about 11:30. My Oncidium twinkle and prostechea cochleata are both sending out flower spikes. Should I assume that's bright indirect light around 20k lumen? Thanks!

[Roberta]

I have no idea... someone who actually measures light will have much more useful information on this one. All of my experience is purely empirical and qualitative.