Hi,
I use mh and have no trouble flowering vandas, I use 250 watts which give out an average light measurement of 4,500 fc. Hps are supposed to be good for flowering but I wouldn't touch them, the light is very unnatural, makes the plants and flower colours look unnatural and is a very dingy light. My vandas flower 2-3 times a year so can't see what the fuss about sodium is?
Pals
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