Emu XL-7 & MP-7 User's Group

Yeah an LED is actually a special kind or semiconductor chip. The 
makup and design of that chip determines the color. An LED is kind of 
like a laser in that it is one color and it can only be that one 
color. Many LEDs these days have clear housings regardless of color. 
Red, green, yellow and pretty much all colors but blue and white use 
about the same voltage (about 1.5 volts I think). Blue LEDs require 
about 3.5 volts. White LEDs are actually blue LEDs with some yellow 
phosphor that absorbs some of the blue and retransmits it as yellow 
to make it appear white. Last time I checked White LEDs run about $3 
each in small numbers. 

OK so I am not an electrical engineer but I have made my own white 
LED strip lighting for my studio. It should be possible make a blue 
LED array powered by the 12V jack on the front or change the internal 
LEDs to yellow or green but changing the internal LEDs to blue or 
white is going to be problematic.


Ezra

--- In xl7@y..., Aaron Eppolito <aarone+list@e...> wrote:
> The LEDs themselves are colored.  White LEDs are not cheap (neither 
are 
> blue, actually).  They are very small surface mount parts, and 
would 
> take a steady hand (and a willingness to void your warantee...)
> 
> -Aaron
>