Maximizing Efficiency: Using Luxeon S LEDs for Solar Simulator Design

AI Thread Summary
To create a solar simulator using Luxeon S LEDs, achieving a net intensity of 1 Sun (1000 W/m^2) is challenging due to the differences in light spectra between HPLEDs and natural sunlight. The Luxeon S LXS8-PW30 emits a radiant flux of 4113 mW, which translates to a limited illumination area of about 2 cm² at that intensity. Filters may not effectively compensate for the missing spectral lines, as LEDs produce narrow bands of wavelengths rather than a full spectrum. The discussion highlights the importance of understanding color temperature and the limitations of LED technology in replicating sunlight, particularly in the infrared range. Overall, while Luxeon products are praised for quality, caution is advised regarding inferior imitations.
jefinjo
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I want to make a solar simulator with LEDs. I want to get a net intensity of 1 Sun(1000 W/m^2). My LEDs have the following specifications:

LUXEON S LXS8-PW30

Luminous flux at 700 mA, 85°C* 1315 lm

Radiant flux at 700 mA, 85°C 4113 mW

1931 CIE color points at 700 mA, 85°C (0.4304, 0.4030)

CCT at 700 mA, 85°C 3105 K

Distance to detector: 200 mm
 
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There are important differences between HPLED's light spectrum and solar sea level light spectrum
 
zoki85 said:
There are important differences between HPLED's light spectrum and solar sea level light spectrum
Yes. How can we tackle it? Are filters helpful?
 
I think it is a very challenging task if you want to be accurate, no matter what method and means you use.
 
jefinjo said:
Yes. How can we tackle it? Are filters helpful?
A filter cannot supply the missing spectral lines in the light that comes out of an LED. LED's are designed to provide a 'sort of' match to the light of a black body radiator (tungsten filament or sunlight) using three or more LEDs, each of which will only produce a narrow band of wavelengths.

It would all depend upon what you actually want from this 'simulator' and what the light will be used for.
 
jefinjo said:
I want to get a net intensity of 1 Sun(1000 W/m^2).

Over how much area ?
If we believe this
jefinjo said:
Radiant flux at 700 mA, 85°C 4113 mW
That led puts out 0.4 watts of radiant energy... so one of them will illuminate .0004m^2 to that intensity, about a 2 cm square.

http://www.philipslumileds.com/products/luxeon-s/

Last time i looked into them white LED's used a phosphor to make "white" light from a UV led's emissions, much like a flourescent tube.
Various phosphors make various shades of white...
You might read up on "color temperature"
http://en.wikipedia.org/wiki/Color_temperature
because i notice your LED comes in various color temperatures

Lastly, sunlight is about half infrared and your LED won't contain nearly that much. See its spectrum on the datasheets at Phillips.

Those Luxeons are a grreat product. Beware of the cheap Chinese imitations, the ones i tried were disappointing.
 

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