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Re: [APD] LEDs once more

I believe Jerry Baker wrote this email section below:
> TBarber wrote:
>> Good points.............he didn't also mention the heat output compared to
>> metal halide.   I avoid metal halide for this reason.    Some aquarists
>> would pay for a superior light ..........I will pass this along.  Not sure
>> if we account for the majority of aquarists.
> If you haven't dealt with high-power LEDs, I can tell you that they are 
> very hot. The reason all high-power LED flashlights are aluminum is to 
> act as a heatsink. The whole body of the lights can get up to over 
> 100°F, and that's just for a couple hundred lumens.

Metal halides get hot too.
These LEDs give off 1.1W each so not a huge heatsink required.
A simple fan mounted above them is all that is required, not rocket science.
Heatsink temperature control is a very mature technology.

> Also, the price of LED, even when factoring in its long life, is still 
> much higher than HID or fluorescent. The technology will mature 
> eventually, but it's not there yet.

But according to the prices today they already seem cost effective.
Did you read my posting on this? :-)

Stuart Halliday
200 Million years in the making...

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