A few notes/clarifications, I think mostly covered elsewhere, just wanted to mention it here just in case.
- GS2808/GS2806 with built in patterns can look glitchy sometimes when there is a pause in data. Pixelblaze may pause data when switching patterns or saving data to flash, or if there is a code error in a pattern.
- I’ve had some reports that gs2808 can fall back to a 400khz data mode, mostly reported with V2 Pixelblazes. I think they look for certain timing clues, switching automatically, and are thus not as forgiving as WS28xx type LEDs and other clones. In general the output expanders and V3 have more conformant data signals than V2 does (though V2 has more flexibility in data rates).
- Both GS2808 and WS2815 12V LEDs work by running the RGB elements in series so that they use the same current/power regardless if they are turning on a single element, 2 elements, or all 3. They will still use less power with lower brightness levels.
I’ve measured WS2815 @12V using 12.04mA to 12.58mA when drawing at full brightness. The lower current figure is actually white, and the higher value is a solid color, I’m not quite sure why. I’ve seen them draw 1.85mA when idle / black.
I don’t have figures for the GS2808 but I suspect it is similar.
@jeff Quindor’s measurements are at the AC input to his power supply (or at least originally were), so you have to figure power supply conversion losses (the efficiency of which varies by load). That data is good for relative comparison, but not going to translate to what you would measure on a multimeter or what you would use to calculate your output load requirements.
@Gabe Keep an eye out for some tricks used in other 12V addressable LEDs, like that 12V APA102 strip you linked, that will most likely run 3 LEDs in series (not elements), meaning each “pixel” is actually drawn on 3 different LEDs. Good for zone lighting, but not fine-detail pixels.
Yet another thing to look out for is inefficient 12V addressable LEDs that wire single elements to parallel lines, for example WS2811 can be used with 12V to efficiently drive 3 LEDs per pixel, or a single LED inefficiently – both configurations draw the same current/power, but with the single LED setup the extra power is lost as heat.