These 4-pin Philips lamps offer good color rendering and long life. They are suitable for use with rapid start electronic and dimming ballasts. These lamps feature Philips ALTO® technology, which means they have low mercury content. These 27K (2,700 degrees Kelvin) lamp are "warm white" in color.Rated Lamp Life: 10,000 hours Base: G24q-3 (26W), G24q-2 (18w), G24q-1 (13w) Color Temperature: 2700 degrees Kelvin Color Rendering: 82 CRI Light Output: 1800 lumens (26w), 1250 lumens (18w), 900 lumens (13w) Length: 6.5" (26w), 5.7" (18w) 5.2" (13w) Origin: Holland