This 4-Pin DD Style LED lamp can save energy up to 65% comparing with traditional Fluorescent 2D fittings. With a long life of 30000 hours, these are 3 times longer lasting than with Fluorescent 2D Lamps 12W 4000K Cool White lamp with 30,000 hour average lamp life Direct retro fit replacement for DD flourescent lamps Popular RG10-q base and standard shape for direct replacement of RG10-q base 78 Lumens per Watt output (940 lumens in total) Ideal for schools, hospitals, clubs, warehouses, cold rooms, stairways and corridors ect