Brightest gd bulb I have ever used.Typical medium-base light bulbs come in three "white" colors; soft white (2700k), bright white (3000k), and daylight (5000k). The measure of illumination, or brightness (not color), is in lumens, with typical lumens for standard bulbs 60w (800 lumens), 75w (1120 lumens), 100w (1500 lumens).These studs are 5000k and 2600 lumens. let that sink in.Bought them for the wife's living room. She's always complaining that the lamps in the room she damn well never uses bSee full review