Light levels for orchids.

[bil]

Originally Posted by Ray

Yes.

1) For artificial lighting, the intensity should be no more that 50-55% of what various guides give for recommendations. In other words, if the AOS culture sheet recommends about 3500 fc for cattleyas, that is the peak, noontime intensity to which it should be exposed, meaning the average will be lower (Read this)

2) Try to think in terms of PAR and PPF. Particularly the concepts of flux and volume of light received.

FC and LUX are measures related to the light sensitivity of the human eye, not plants.

Ray, can you expand on PAR and PPF please? I can get DLI and ppfd on this app