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A few points that don't fit into a comment but could help you: Get a better laser source than a 4 \$laser diode. "Better" means a laser with higher beam quality. When you look at a laser's data sheet, it should specify a value$M^2\$ or "BPP" (beam parameter product). Both these numbers are related, the smaller they are, the better you ...

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Indeed you need a spectrophotometer to analyze the spectrum of the light emited by the LED. However a spectrophotometer will not give you "color information" but only a spectral power distribution, something that looks like this: Or like this: Or even like this: Keep in mind, however, that this is not "color information" but only a ...

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The answer is YES for monochromatic LEDs and "not really" for Phosphor-converted LEDs. Monochromatic LEDs can change a lot in color depending on the operating temperature, with probably the worst ones being the Amber LEDs (590~600nm) that shift from amber-yellow to red when heated. Since you are talking about "white" LEDs, you are talking ...

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