Philips 40-Watt 4 ft. Linear T12 ALTO Fluorescent Tube Light Bulb Cool White (4100K) (2-Pack)Light your basement, garage or workshop with the Philips Linear Fluorescent 40 Watt T12 cool white light bulb (F40T12 CW 4100K). It makes cool white light that is ideal for a work like environment. Philips Linear Fluorescent T12 light bulbs feature ALTO Lamp Technology. Brightness: 2600 Lumens Estimated yearly energy cost: $4. 82 (based on 3 hours day, 11c kWh, cost depend on rates and use) Lasts up to 21. 9 years (based on 3 hours day) Light