1. Mine from shopee. Mine is square 6inch.lagi difficult to find. Only 2 3 seller I remember. Led is quite directional so the quality of reflector is less important. The diffuser of the led bulb does most of the job.
2. Gap is at the e27 socket and the reflector cone on top. Compare to the flush lamps that don't have gap lah.
3. Yes. Measure first.

This post has been edited by fireballs: May 8 2021, 11:36 PM