Philips Daylight Deluxe Linear Fluorescent T12 Light Bulb: 4-Foot, 2325-Lumen, 6500-Kelvin, 40-Watt, Bright White, 10-Pack ENERGY EFFICIENT: Philips Daylight Fluorescent T12 Light Bulbs have an estimated lamp life of 20,000 hours. BRIGHT WHITE: At 6500-Kelvin, Philips T12 Light Bulbs deliver bright, crisp color ideal for indoor, commercial, and residential use. VERSATILITY: Philips T12 Light Bulbs are used to brighten laundry rooms, bathrooms, and workspaces. ECO FRIENDLY: These Philips daylight light bulbs are low mercury and use recycled glass and packaging material, reducing environmental impact. COMPATIBILITY: These Philips light bulbs fit in bi-pin bases. Not compatible with Philips HUE products. Philips T12 light bulbs are for non connected use only.