| http://www.w3.org/ns/prov#value | - This can make them last substantially longer than anything else and should be factored when considering their efficiency and cost I believe.It looks like there is a few ways of creating white LEDs, including using separate red, green and blue LEDs (although this is rarely mass produced) and using near UV emitting LEDs in a similar fashion that you described, which results in a better color spectrum
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