3 inch and 4 inch downlight diameter is how much?
3 inches /3W, diameter 110, opening 854 inches /7W, diameter 150, opening 130.
This is a reflection of the lamp diameter, usually, the diameter of the lamp body is so big, but the installation hole reserved spring section, so the need for +2 cm.
3 inch downlight conventional size: 11.2 cm, 9.5 cm hole is. Conventional size 4 inch downlight is 14.3 cm, 12 cm hole is.
