How can I measure the wavelength of a red LED?
I need to find a relatively cost effective way to measure the wavelength of red LED lights. I need to test several to find their wavelength range, then purchase more red LEDs, and measure them so I can keep the ones that fall within my wavelength range, and discard the others. This is for a machine that picks up red light from a relatively specific range, and the LEDs on it currently have lost strength (many are from the early 90s, some even older). I need to replace the existing LEDs with others of compatible wavelength. Also, in keeping with my explanation, red LEDs with weakened strength would still have the same wavelength light, but less intensity, correct? Thank you very much to anyone who can help me out with this!
2 Responses
formerly_bob
14 May 2010
The One Who Know
14 May 2010
If possible, check the original specifications so that you can directly order the LEDs of the right wavelength. IF that is not possible, you can take out a working LED from the unit and compare the color with the new LED that you are planning to buy. Cheap spectrometers are available but how far they will serve your purpose is not clear.
You may be able to purchase a diffraction grating for a reasonable price.