My bad. I thought it was a guess at best!
Ursula, morning light, morning light! And not nearly as intense as we might normally think. If we say Cattleyas like 3,000 foot candles for four hours or so and Oncidiums like 2,000 foot candles for 2-3 hours, then walkeriana likes it a little cooler, 2,500 footcandles for roughly two to three hours.
Oh, and they like to be anchored to a pot or mount and with a few growths with their roots free to 'sniff the morning breeze'.
