On Thu, 10 Nov 2005 00:46:58 GMT in 6Mwcf.21981$Ny6.7782@trnddc06 Gene Schurg wrote:
Pat,

I've seen the ads for LEDs in the Orchids Magazine. When I think of LED I
think of the little red light on the front of my PC. I can't imagine they
give off enough light for plants let alone to light a room.

Look at a traffic light that has had the light bulbs replaced with
an array of LEDs. In fact if it's a retrofit, you'll probably be able to
compare lightbulb and LED as they usually wait for the yellow lights
to burn out before replacing them :-).
Granted, the reason LEDs are going into those applications is useful
lifetime.

As for the person with the light intensity per watt.
My understanding is that the smaller the tube diameter, the more lumens
per watt.
But the other factors are
1) Cost of bulbs
2) bulb life
3) Cost of fixtures

The last time I looked up the relative costs, 4' and 8' T12 bulbs
were at a price point to make up for their added electricity consumption,
but that analysis was done before most offices went to T8 bulbs...
Anyone know of a more up to date analysis?


--
Chris Dukes
Suspicion breeds confidence -- Brazil