> From: "C.H.Ling" <ch_photo@xxxxxxxxxxxxx>
>
> No, a good design LED lamp drive has little power lost, I believe in
> the 10%
> range...
You have to be careful about what you're measuring and how you measure
it.
In terms of total *luminance* efficiency -- total amount of light
emitted per power consumed -- fluorescent lights are better than LED
lights. But fluorescent lights emit light in all directions, and
require a lens or reflector if you want that light concentrated.
In terms of total *illuminance* efficiency -- total amount of light
striking a constrained area per power consumed -- LEDs are better than
fluorescent lights. But LEDs have a built-in reflector and lens, and
require a diffuser if you want light over a large area.
My rule of thumb: use fluorescent lights for area lighting, and LEDs
for task lighting.
> Low
> power lamp is very important to us, we use air conditioner in
> summer, every
> watt of power dissipated by lamp will be doubled.
Perhaps not quite that bad. If your air conditioner is good, it might
have a SEER rating of 3 -- which means (roughly) that it will remove 3
watts of heat for every watt it consumes.
----------------
What happens when a reinforcing loop and a balancing loop are both
pulling on the same stock? This is one of the most common and
important system structures. Among other things, it describes every
living population and every economy. -- Donella H. Meadows
:::: Jan Steinman, EcoReality Co-op ::::
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