Re: [APD] Lighting

[Paul M Wallace <pwallace at u_washington.edu>]

Yes, flashlights and LED are made for each other.  Reason 1, the "standard 5 volt .06 amp 20,000 hour incandescent" bulb puts out ~2.1 Lm/W and the #2, the beam is focused resulting in more light in a narrow spot.

And because every one of my posts come with a supporting link...
http://members.misty.com/don/lede.html#t

********************************************************************
Paul M. Wallace                                            CHB G013
Graduate Student                                  Lab: 206.616.2914  
Chemistry Department                              Fax: 206.685.8665 
University of Washington                  pwallace at u_washington.edu 
Box 351700
Seattle, WA 98195                                                                      
********************************************************************

On Fri, 7 Oct 2005, urville wrote:

> well i assumed since you could run an led flashlight for a lot longer on
> the same batteries just for one example and get quite bright lighting
> they were more efficient... of course again i'm not talking about for
> plants... i dont think we are there yet.
> am i wrong in this, it seemed common sense to me
>
> S. Hieber wrote:
>
>> Actually, no, LEDs are not. The really bright ones are a
>> bit less energy efficient than good fluorescents and
>> actually depend on fluoresence to emit light.
>>
>> The highest energy efficency of lighting lamps belongs to
>> certain of the mercury-vapor gas lamps. Not the MH ones
>> that one might use on an aquarium but ones with output in a
>> very narrow band of the spectrum. They are suitable for
>> special purposes and some have energy efficiency over 80%.
>> The ones suitable for aquaria have about the same energy
>> efficiency as fluorescents, roughly 35%.
>>
>> sh
>>
>> --- urville <urville at peoplepc_com> wrote:
>>
>>
>>
>>> i believe LED's are the most effeicient lighitng
>>> as to how available they are in anything that does us
>>> anygood i dont know
>>>
>>> Jerry Baker wrote:
>>>
>>>
>>>
>>>> They don't even cost more hardly anymore. I see 4-packs
>>>>
>>>>
>>> for $8 all the
>>>
>>>
>>>> time in Home Depot.
>>>>
>>>>
>>>>
>>>>
>>>>
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>>>
>>>
>>
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