I have my Maikai 'mayumi' mounted on drift wood. I used to keep it in nearly full sunlight like my brassavola and strap leaf vandas. Then when we moved, out of convenience I sat it in the corner with my oncidiums and bam I got a spike. So...maybe when they are growing they need sunlight, but when you want them to bloom give them abit more shade. In fact, mine gave it's nicest bloom in the garage last winter.