On 1/12/2016 6:24 AM, Frank wrote:
Surprising how inefficient even new lighting sources, CFL and LED, both are.

Lots of room for improvement.

When I originally set out to add some "heat" to the citrus trees,
I naturally thought of using large "power resistors" (being an EE).
But, power resistors cost a lot of money (in the kilowatt size).

OTOH, 1000W of "light" at 95% INefficiency does the trick on the cheap!

[they are also handy as cheap "power supplies" -- for certain types
of electrical loads]