You may have mismatched strips, or, if they're
color, they're notorious for not producing consistent whites. That's why theatrical
lights have gone from RBG to RGBW, as they now have dedicated white
LEDs in them to produce more consistency in the whites.
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LEDs produce different colors by using various materials which produce photons at different wavelengths. ... Combining red, green, and blue LEDs in a single LED device, such as a lighting fixture or multi-chip LED, and controlling their relative intensities can produce millions of colors.