Nope... It does not block the lights. The OEM lights are fixed so you can't move them, the LED's are angled down. We attached the FEL and checked the out light output before making the lights perminent. With the FEL attached driving at night the OEM lights bounce off the back of the bucket. I can turn off the OEM lights raise the bucket turn on the LED and they shine under the FEL.
Plus it make a huge difference mowing in the evening!