I bought 1 warm white and 1 cool white to test. All I can say is WOW, much brighter than expected, I can cut back on lights needed, sweet. They turned on a little delayed at first, not much, but once warm, came on as expected. Haven’t tried a dimmer, yet. Nice looking, easy installation, great for new construction, cost savings by using a standard 4” box and they work just as described. I would recommend highly so far. Polar-Ray and shipping were fast, thanks!