To light up a room....

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**DONOTDELETE**

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I've been cruising the web for awhile now, trying to glean some info on a LED lamp. It's hard to find anything, but I did come upon this forum :) Before I look any further, has anyone attempted to light up a, say, 20x15x9ft room with an led array? I was thinking of 60 whites and 40 violet or blues.. 4 or so in parallel onto a transistor and d/a converter, all connected to a microcontroller. lighting effects unlimited :) so the deal is, im not an optics specialist and have a hard time with lux values, led angles etc... I can never seem to figure out how much power each led would need, etc...
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my question is, is it reasonable to generate 100 lux with 60 white leds? if there is no straightforward answer, I'd appreciate a pointer to a website that covers such calculations in detail, math I can handle... thanks very much,
 

lambda

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Checkout Lumileds they make the Luxeon LED that outputs 15 lumens. However, be warned, that right now those of us who have recently ordered Luxeons have gotten some less than grade A parts; pea green in color instead of white like in the past. But if they get their quality back to where it was, yes they make a 18 LED flood that generates 325 lumens.
Check out http://www.luxeon.com/products/flood_index.html
 

Brock

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I am confused as to why you would want to go the LED route? compact fluorescent are about twice as efficient as LED's and cost FAR less. You could even go low pressure sodium, about 4 times better then LED's, but then everything is orange
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The only reason I can think of is it won't burn out?
 
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**DONOTDELETE**

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Yeah compact fluorescents are the way to go. I think they're about three times as efficient as the Luxeon and the newer models put out a pleasing warm incandescent colour, not the cold blue white of yesteryear's CF (or current Nichia LEDs).
 

vcal

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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Ted the Led:

--what's a "cold cathode fluorescent"?
<HR></BLOCKQUOTE>
The CCFT fluorescents I'm familiar with are usually employed in backlighting notebook computers, pocket TV's etc. That booklight you linked to is an example.
Their characteristics are:
1. really compact
2. curmudgeonly on current draw
for instance, the booklight (I have one), only draws 300mA, as opposed to 600mA+ on a standard cheap low powered tube.
3. A lifespan of 10000 hrs.+, compared to only 3000 or so.
4. greater resistance to blackening at the ends of the tube from low battery voltage.

-For a more arcane description, you'll have to hear from the engineering tech-types that hang around this board
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**DONOTDELETE**

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oh wow!! Thank you vcal, thank you Duggg! (edit) and thank you mr.glow!
 
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