Not dimmable; Luminous flux: 10400-11600lm; Ultra-high brightness and energy saving, 50000 hours lifespan Heat sink and built-in fan ensure good heat dissipation 360 degree beam angle; No UV or IR radiation in the beam and no flickering Overall dimension: 10-5/8' x 4-15/16' x 4-15/16' (27x12.5x12.5cm); E39 socket, easy to install and operate UL certificated; Great for using in shop mall, coffee shop, supermarket, office, factory, workshop, warehouse, storage room, building, corridor, museum, etc.