Review on TORCHSTAR Ultra Thin Recessed Dimmable Downlight: Industrial Electrical Lighting Component for Efficient Illumination by Renee Robinson

Overall I am very pleased with these lights. The hole pattern is metric. You can use a 3" hole saw, but 2-7/8" gives a tighter fit. Than When I first connected them to my Lutron dimmer the light just went to maximum and I assumed they weren't compatible with Lutron dimmers, however by swapping the live wires top to bottom and vice versa the dimmer worked.