Growing Cattleyas under PAR38

[ALToronto]

Naoki, I think we're discussing different points about phosphors. I looked at a lot of spectral graphs of different LEDs before I bought the diodes a year ago. For 6500K, they all looked pretty much the same, just as 3200K lights from different manufacturers had almost identical spectral profiles.

Of course, when you start looking at special, pinpoint wavelength LEDs, phosphor recipes are specific and very proprietary. And I'm not as 'plugged into' (sorry, couldn't resist) the latest research as you are, but I'd be very surprised if there were no innovation in phosphors for consumer lights. I'm talking about more common, currently available lights of the same colour temperature.

I also agree with This Side of Paradise, but this discussion was started by a windowsill grower. All commercial growers, whether pot or orchid, need to be energy efficient. Still, even if I were a commercial grower, I would want to see my plants in proper, white light. Too much information is lost when you cannot see the leaf colour.