On 5/4/2011 11:48 PM, hr(bob) wrote:
On May 4, 6:50 pm, wrote:
On 5/4/2011 3:55 PM, Larry Fishel wrote:

On May 4, 2:30 pm, wrote:
Googled this up at HD:

http://tinyurl.com/4xx897u

Interesting that the stated power consumption for this bulb is
actually HIGHER that for a 40W equivalent CFL...

A lot of light being wasted in a filter to improve the color?

I was wondering about that but had not looked up the comparison.
I don't know a lot about electronics but do know that LED's need direct
current so part of the extra energy may be in the AC/DC conversion.

I would worry about the color too. I had bought a couple of CFL's that
put out such white light that I could not use them indoors and had to
consign them to the front porch.

CFL lamps also require dc, they rectify the AC powerline ti dc, and
then run a high-frequency dc - ac converter tolight the lamp tube
itself. There is a large step-up in voltage needed to strike the
initial arc thru the tube, and the reduction in mercury reduces trhe
pressure in the tube until it heats up a little. Regular tubular
fluorescents contain appreciably more mercury than the cfl's do
because the arc lengthis mujch longer and the diameter of the tube is
much larger.

Did not know that. I do recall someone posting a diagram or picture of
internal electronics for a cfl and there was a lot of stuff in there.
Surprising that they can make them so cheap.