How to switch over from 250W MH to DIY fixture on 20" cube

[TheMikey]

Well, with Reef Angels, you can set your dimming parabola in the software provided or you can code it yourself. The fact that there's a ramp-up means that your corals won't be totally exposed to your daylight bulbs the whole day at their highest intensities.

I'd try a peak at 40% and 4-6 hours and ramp up and down on an hour-long period. That said, I have no idea how the lights will compare to your MH. Did you base your DIY LED on someone else's build?