[sdiy] Coloured LEDs

[Mike HEQX]

Very interesting. Subtractive filtering does work, but it's limited and 
you have to test it out. Might be fun to cook up a unique color if you 
re-encapsulate a white phosphor LED.


On 2/18/2017 8:35 PM, rsdio at audiobanshee.com wrote:
> Wow, we are REALLY nerding out on colors in this thread.
>
> To sort of bring it back on to the synth topic before I add another nerdy point, here's what Wendy Carlos has to say on the topic:
>
> http://www.wendycarlos.com/colorvis/color.html
>
>
> The point I wanted to make to Mike is that all LEDs except white use chemicals to create the color, rather than filters or dyes. In other words, it's additive synthesis, not subtractive synthesis. If you tried to use acrylic dye, you'd be sacrificing brightness and electrical power by absorbing parts of the spectrum that were already created. Granted, there are only a finite number of chemicals that can be used to make a light-emitting diode, so obtaining more colors might require a little subtractive techniques besides the additive ones. Today's bright LEDs could use a little attenuation anyway. By the way, white LEDs sometimes use phosphorescent chemicals to enhance the balance of the spectrum and shift things more towards white than plain additive color synthesis. But RGB LEDs are typically very poor at obtaining white when compared to something designed specifically to produce pure white.
>
> Brian
>
>
> On Feb 18, 2017, at 12:50 PM, Mike HEQX <mike at heqx.com> wrote:
>> I have not tried dying LEDs, but since you can dye acrylic and PVC  ( using a solvent carrier ), I am pretty sure you can "enhance" the color with a little dye.
>>
>> On 2/18/2017 12:52 PM, Mattias Rickardsson wrote:
>>> They are RGB, so they just LOOK LIKE any color you like. :-)
>>>
>>> /mr
>>>
>>>
>>> Den 18 feb. 2017 6:03 em skrev "Ingo Debus" <igg.debus at t-online.de>:
>>>> I like these:
>>>> https://www.adafruit.com/products/1655
>>>>
>>>> Any colour you like. But the communication protocol is tricky.
>>>>
>>>> Ingo
>
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