This is really amazing for my huge master bedroom with a very high ceiling. Extremely bright and less eye tiring when using a laptop. 105W/500W (equivalent power output) Spiral CFL Daylight. Suitable for E26/E27 plugs. 5500K (I would like 5000K). 4500 lumens (I would like 7000 lumens). 9 inches long, diameter: 3 inches. Color rendering index: 85-90. ROHS and CE certificate. Lifetime: > 8000 hours (preferably > 80,000 hours). Up to 80% energy savings (compared to a 500W incandescent lamp). My previous CFL was only 45w/250w equiv. That's 105 watts. So I know I will see higher electric bills. It's still worth it.