Philips 40-Watt 4 ft. ALTO Supreme Linear T12 Fluorescent Tube Light Bulb, Cool White (4100K) (10-Pack)For the home or office, the Philips 40 Watt Cool White Linear Fluorescent Light Bulb (F40T12 CW SUPREME) is a great lighting source. It provides cool white light with an output of 2600 lumens. This bulb features ALTO technology for low mercury content. It's a more environmentally friendly lighting solution than traditional fluorescent bulbs. Brightness: 2600 Lumens Estimated yearly energy cost: $4. 82 (Based on 3 hrs. day, 11c kWh. cost depend on