The 18W LED's that I used are 1360 Lumens each.
http://www.amazon.com/gp/product/B00DR67P9I/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1
I don't have any pics of the rear lights yet, but they're, IMO, pretty bright, with good coverage. Plenty to work by, and with two separate lights they can...