Review on Upgrade Your Ceiling with Sunco Lighting's Slim 4-inch LED Recessed Lights by Erika Howard

The fit and ease of installation was great. The problem was that the boxes were flimsy plastic and the bulbs were not grounded. On a 15 amp circuit with nothing but those bulbs present, plugging in the vacuum resulted in rapid dimming and a return to normal. I replaced them with slightly more expensive (grounded) bulbs and didn't have the same dimming problem. You get what you pay for.