LED's brightness
LED's brightness
(OP)
what parameters will affect the LED's brightness? is it the brightness of LED is total up of each LED i have dispate the distance between them?
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RE: LED's brightness
1) The dispersion angle of the LED. A 90 degree LED spreads its energy over a wider area than a 30 degree LED so it will appear to be less bright.
2) The current. The more current run thru an LED the more output power which all things equal with appear brighter. Of course the LEDs life will always be shorter the more the current you run thru it.
The rest of your question makes no sense in English.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: LED's brightness
1) What parameters affect an LED's brightness?
2) Is the brightness of a group of LEDs the sum of each LED’s brightness, despite the distance between them?
RE: LED's brightness
If there is no lens and the LEDs are far apart you will get a larger pattern of light rather than a brighter spot.
RE: LED's brightness
Take the example of using a beamsplitter to add two sources. Say the beam splitter is 50/50, the net output is then 50%*L+5-50%*L = L if both LED are the same brightness.
You can change the illuminance at the destination, by adding sources, not unlike stage lighting, but the angle of acceptance is quite large then.
TTFN
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RE: LED's brightness
In layman’s terms, you get more illumination on a workbench if you hang up more fluorescent tubes. The result is a “brighter bench”. Now whether this constitutes a “brighter light” clearly gets a bit technical.
If these LEDs were so far away that they both fell within the airy disc, I would have expected the resulting source to look brighter, but IRstuff is the expert here.
RE: LED's brightness
After a fifth and sixth reading of the OP's last question, I get the impression the LEDs are spread apart some distance. In that case, the off-axis brightness will need to be taken into account. Time for the OP to come back and give us some more info.
Dan - Owner

http://www.Hi-TecDesigns.com