Affect of artificial light on Orchids

[Ross]

I have my opinion (that I care not to express right now ) but I am interested in observations of amount of light from artificial sources vs natural sunlight. In other words, we all know some orchids want "full sunlight" but isn't that during the middle of the day . If I were to supply 2500 foot-candles light (not a huge amount) from lights for a constant 12 hours or more, would that equate to something higher (like 3500) for a short time? So I am interested in a discussion on personal observations (not Google) related to how folks grow their 'chids and if under lights, what observations they've seen.