F.W.I.W. I inherited a L.E.D. Headlight light bulb when I purchased the 2006 Sportster from a friend. I added the oval accessory fog lights by H.D. that I had previous experience with. This combination gave pretty good illustration especially on the dark rural roads I find myself on when night running. Shortly after purchasing the bike I noticed that low beam performance became less than ideal and I found myself running the hi-beam more and more finally realizing that the low beam was failing and almost unusable. I chose to replace it with a J.W. Speaker L.E.D. headlight and the difference was amazing. This is without question the absolute best headlight I’ve ridden with in over 60 years. An excellent rectangular beam with tremendous reach, a crisp cut off on top and a very nice half moon fill on the bottom which gives me a very good read on road surface condition. This is not a cheap headlight and I’ll share this, compared side by side with a friends Sportster with a very inexpensive L.E.D headlight our beams displayed on the back of his overhead garage door were illuminating. His had a very similar rectangle beam, noticeably not as bright as mine and slightly less bright and the lower fill noticeably less. But please note that he rarely rides at night and his light was great for his needs. Mine on the other hand was much more pricey but in my case I need all the light, within reason, that I can use. Now the auxiliary lights were replaced with the “Cyclops” Pegasus units, similar to the Denali S4’s, with two spots above two floods giving me a far better shoulder illumination than the H.D. Units. I also chose to add the dimming controller, which was controlled by the hi-beam switch and I could program a “low-beam” at 10 per cent increments for my low beam on the auxiliary driving lights. I’ve been running them at 50% an have been extremely happy with the performance. Once dark humps on the road shoulders became raccoons and opossum. Deer light up much further back giving me greater comfort , less stress, running in the rural areas. I may try a set of the D4’s in the near future, again for peace of mind and more reaction time with late night encounters.