I am using a galaxyhydro fixture that I modified the array with more violet and 20k chips. This fixture runs 5v PWM dimming and works seamlessly with reef-pi. I am super interested in SB's array. I do think that they run 0-10v analog dimming but I think that Ranjib was looking into the feasability of 0-10v PWM to analog fixture.
Yup, I have tried it out in multiple ways. Depending upon what you are controlling there are couple of different ways to do that.
For things like Kessil, where we have to generate 10V pwm just to control the channels, while Kessil has its own dedicated power, we can do such circuit, where current draw is relatively low (50milli amp) we can use a 10v power supply and any common npn transistor(such as PN2222a) , along side a 1K and 10K resistor for each channel, circuit can be found here:
http://birota.azurewebsites.net/content/images/2015/03/im5-1.png
For other cases where we have to power the LED itself (the power draw is high), we can use a logic level power mosfet or a darlington IC (ULN2803a or L293d). You can find those circuit example in adafruit website straight.
I am pretty sure that I can use reef-pi to make even a low cost LED bulb like this one :
https://www.amazon.com/dp/B01LWP37SD/ , which is very exciting, as I know first hand these bulbs work just fine for almost all lps/softies in a pico tank. and this will be a radically cheap but prudent lighting solution.
anyway.... coming back to the original topic, do let us know what light you are going with, since I have not used these blackboxes I cant say for certain, but I think the normal npn transistor based approach will work. If not, we'll figure out what works... should not be impossible (use multimeter to detect what the circuit expect, and we'll come up with transistor that can boost 5v pwm to that level)
