Vanda Light Requirements
 

Hello!

I have been perusing a few different sources on light requirements for vandas. I seem to be seeing conflicting information. A few resources suggest around 50k lux / 4500 ftc (which seems correct to me). I know they need lots of light. There is this a popular guideline however on a few threads which seems to be in conflict (see below). My understanding is that 50k lux will be around 1000 PPFD, so 200-300 seems extremely low. Can anyone clarify? Not sure if it has something to do with the units being m2 or ft2?

Thanks!

Light Targets for Orchids

20 umol/ft2 (~65 umol/m2s PPFD) – for low-light orchids (Phals, Paphs, Jewel Orchids)
30-40 umol/ft2 (~131 umol/m2s PPFD) – for moderate-light orchids (Oncid, Phrags, Epidens, Dends etc)
50-100 umol/ft2 (~200-328 umol/m2s PPFD) – for high-light orchids (Cattleya, Vandas)
**Converting feet to meters: 1m = 3.28ft