&gt; Kind of. The really high efficiency LEDs are blue. The problem is with the efficiency of green LEDs.<p>Hu? That&#x27;s not true. Blue is less efficient, not more. The lower the wavelength the more efficient (toward the red side of the rainbow).<p>Also mono-color LEDs are MUCH more efficient than the ultraviolet ones with a phosphor (AKA white) ones.<p>If you wanted efficiency then have red and green in an LED, and that&#x27;s it. You don&#x27;t really need full color at night.