Philips 21-Watt 34 in. Linear T5 Fluorescent Tube Light Bulb Bright White (3000K)The Philips 21 Watt Bright White Linear Fluorescent Light Bulb (F21T5 830) casts a crips, bright white light that can last up to 20,000 hours. You can use this bulb in almost any room inside of your home or business for general light needs or in the kitchen or bathroom. This bulb has a T5 shape with a bi pin base. Brightness: 2100 Lumens Estimated yearly energy cost: $2. 53 (Based on 3 hrs day, 11c kWh. cost depend on rates and use) Lasts up to 18. 2