Looks nice. 1kHz is fine for human flicker resistance, but I've pushed 50kHz on the right drivers which helps a ton for video and photography, especially as the dimming doesn't seem to trigger the anti-flicker algorithms in some cameras.
The whine as you noticed is likely the 1kHz leaking back through something on the power supply. Staggering / dithering should mitigate it for sure.
The whine as you noticed is likely the 1kHz leaking back through something on the power supply. Staggering / dithering should mitigate it for sure.