LED efficiency and brightness questions

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these leds

http://www.us.kingbright.com/images/catalog/spec/apt3216syck.pdf

have output of 150 mcd, , these leds

http://www.us.kingbright.com/images/catalog/spec/apt3216yc.pdf

only have output of 8 mcd.

but both use same current (20 ma), first 1 more efficient , second 1 generates more heat?

second question - light perception logarithmic...so first 1 2x brighter, not 18x brighter, right?

thanks,

chris

yes, first 1 more efficient, due different chemistry.

super bright yellow (algainp) vs. yellow (gaasp/gap)


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