This is a Kosnic 12w 4pin 2D LED lamp in 4000K (Cool White) and is equivalent to a 28w 2D compact fluorescent lamp. This lamp has a GR10q cap, an average life of 30,000 hours and contains 80 LEDs with a lumen output of 1100 lumens. This lamp can be installed directly in replacement of a 28w 4p 2D lamp without modifying the fitting. However, if you wish to get the full benefit from this lamp you can remove the control gear and wire directly to the mains also.Kosnic part code: KLED12STD/4p-W40