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RBG Drive - Varience of whites when leds lit
SavannahLion:
--- Quote from: Dr. Willy on August 22, 2013, 02:00:56 am ---yeah the rgb drive has all the resistors built into it.
See here
http://groovygamegear.com/webstore/index.php?main_page=product_info&cPath=83&products_id=240
I have sent randy a pm asking his thoughts.
I appreciate your help in trying to solve this problem so far.
--- End quote ---
No problem, :cheers: but for future reference, whenever you have a problem you can't solve, you should tell us as much as you can. It saves the person who responds a lot of effort and time not chasing down dead ends like that. No where in your previous posts did you mention using the RGB drive. Not everyone here uses complete package solutions like those offered by Randy (he's a great guy, I purchased from him before with zero problems) so it helps to know, what might seem to you, as unimportant details.
In any case, I'll step out. I don't use the LEDWiz in my own cab so I can't offer anything more.
RandyT:
I guess the best way to start this is to say that if one is looking for a "pure" white light, the only real way to achieve this is to use a monochromatic LED, or to tweak the values of the R,G and B outputs to equalize the output of each color. But even with tweaking, RGB LED's, by virtue of using three separate colors, will always be difficult to get perfect purity, as this relies on perfect diffusion of those three light sources into one.
Also, as SavannahLion stated, there are always going to be manufacturing tolerances which will cause slight variations between parts. The other thing to consider with RGB lighting is that very often, just one color is being used more than the others. While this isn't a big concern for newer parts, over time, the output from LED's will degrade. So, for example, if you have two RGB buttons which are on all the time, one red and one blue, over time, the red and blue components will not be at the same level as the other two components which are not used as often, making those two buttons slightly different from one another when all three colors are enabled. This isn't an issue with something like a large LED video display, where the colors are always changing, allowing the three chips in a pixel to degrade evenly.
All of that being said, the LED-Wiz will allow you to "tune" the white color to make it uniform between units. Most will just find it not worth the trouble, as absolute purity isn't terribly important to most in a control panel application.
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