Don't go here!
As a dutiful reporter, I did show respect for yet another Amazon offering of a seemingly pretty LED disk downlight. The Amazon asked price is $24.95. I got a tempting better deal at Bees Lighting , $19.80 and free shipping. I should now be grateful and uncritical.
This is not offered with hardware to clip into a can light.
See the many slots that will be unprotected against intrusion of light-seeking-always bugs, to die in a pile of litter upon a loosely-attached obscuring lens. An informed installer might tape over the screw keyways. The large openings of lens keyways CAN NOT BE BLOCKED. Seal the junction box air tight, as I do, or don't install such cheap lights.
Keyways for box screws are at small 2 3/4" pitch. Boxes with the small screw pitch are the most likely to be badly installed, with large visibility of spilled light.
Take this side by side comparison as confirmation of GM S4 claimed brightness and color temperature.
If glare numbers were required in advertising and on packaging, the mindless degradation since Sylvania 70732 v1, might have been avoided.