25 Pack of 20Watt 4ft LED Light Bulbs,T8 LED Bulbs 4 Foot,40W Fluorescent Tube Replacement,5500K Daylight White (25PACK 4FT 5500K) Packing including 25pcs 5500K daylight white color 4ft led light bulbs.Must remove the ballast before install the led tubes.And please be noted this is double end powered,that means hot/negative wire at different side. SAVE 50% on your electric bill. Use WYZM 20W LED T8 tube to replace 40W fluorescent tubes. Avoid frequent bulb replacement when switching to a T8 LED which has a lifetime of 50,000+ rated hours (10 years with 8 hours/day 365 days) Instant ON,No buzz,our WYZM t8 led bulbs 4 foot is engineered to light instantly when the switch is flipped ON. No more waiting for old fluorescent tubes to warm up or turn all the way on! Applications:for Indoor fixtures, Home, Shop, Office, Garage, Warehouse, Kitchen, Basement, Bathroom, Workshop Better for you, better for the environment, WYZM LED tube lights save on energy and are mercury-free so they don't contribute to harmful hazardous waste.