Triangle Bulbs T30053-10 (10 pack) - F21T5/850 21-Watt Straight T5 Fluorescent Tube Light Bulb, Natural Daylight, 10 Pack Pack of 10 Bulbs T5 Fluorescent Ideal for homes and business Not Dimmable, No hazardous material like mercury or UV. Long Lasting , Extra Durable Filament