Canuke
Enlightened
LED color quality and purity Q\'s
While I was at the local Party City with my girlfriend picking up some items, I ran across one of those cheap doodads with 10 LED's in it, that spins around inside a sphere to create patterns. In addition to red/yellow LED's, most had 470nm blue ones at the "equator". All but one, that is, that instead had a much lighter blue, tending towards the green -- but definitely still blue, not "traffic light green".
My first question is: why don't I see this color more often? I find that I like it a lot more than the 470nm blue. I'm thinking of finding some to substitute for regular blue in a number of places, in particular computer parts with LED's in them.
My second question is: how much variation in color purity is there in LED's? I ask this question because of the idea of obtaining the above color via color mixing. I've noticed with green LED's in particular, that there's a fair bit of yellow and blue alongside the green, and this seems to wash out blue-to-green mixing. What are the options for applications that demand very pure colors -- other than lasers? Filtration?
While I was at the local Party City with my girlfriend picking up some items, I ran across one of those cheap doodads with 10 LED's in it, that spins around inside a sphere to create patterns. In addition to red/yellow LED's, most had 470nm blue ones at the "equator". All but one, that is, that instead had a much lighter blue, tending towards the green -- but definitely still blue, not "traffic light green".
My first question is: why don't I see this color more often? I find that I like it a lot more than the 470nm blue. I'm thinking of finding some to substitute for regular blue in a number of places, in particular computer parts with LED's in them.
My second question is: how much variation in color purity is there in LED's? I ask this question because of the idea of obtaining the above color via color mixing. I've noticed with green LED's in particular, that there's a fair bit of yellow and blue alongside the green, and this seems to wash out blue-to-green mixing. What are the options for applications that demand very pure colors -- other than lasers? Filtration?