This brings up a question I've been wondering...

The intensity certainly plays a role, but what about the duration of the
intensity? In other words, is 16 hours per day at 1500 fc the same to a
plant as 12 hrs per day at 2000 fc (16 x 1500 = 12 x 2000)?

I know many plants including orchids want a certain amount of time in light
and time without light, but I am not sure if the above example would make a
difference.

Larry


wrote in message
rg...
On Fri, 01 Apr 2005 05:00:02 GMT in
Don Quixote
wrote:
According to the Ultimate Orchid (by AOS), "In general, most genera will
grow well at light levels between 2,400 and 3,000 foot-candles."
Although most people say phal does better at 900 to 1200 foot-candles, I
wonder if it will do well at 2,400 to 3,000 foot-candles?

Remember that a light that produces 3000 foot-candles at
distance x will provide approximately 900 foot-candles at approximately
1.8 times distance x.
The 2400 fc light will produce approximately 1200 fc at 1.4 times distance
x.

If the Phals think it's too bright, you can just move the light
further away.

--
Chris Dukes
Suspicion breeds confidence -- Brazil