I have the Dually D2's and love them. the D2's are
listed as 2600 lumens each. I saw Krista's
listed as 2700 lumens each. I know that different manufacturers measure lumens differently but I can assure you the D2's are for real. My neighbor has the Krista's and side by side I could not tell the difference. The D2's are built solid and are very bright.
Installing the D2's I used this
wiring diagram and
this LED Dimmer, also known as a Pulse Width Modulator-PWM. NOTE you must us a PWM to control LED lighting.
As far as
these type of LED Lights...I tried them, had issues with them and returned them. Further research I believe they are over driven...meaning too much current is being applied making the LED's brighter beyond the limit of original specifications. This will cause very short life. BTW these light can be found all over ebay from many different suppliers. Lights are coming from China.