that also turned out to be defective. Two rows of the lights didn't light. So this was replaced immediately by one that they had tested in house. Did a little burn in and then installed it today with no problems. HOWEVER, when I checked out the rest of the lights discovered that 3 of the 4 rows of the white stern light had also failed. So that one went back to Lopo this afternoon for yet another replacement. 2007 must have been a bad year for LEDs.