Per the SRAM technical manual the iLight uses sealed cartridge bearings so presumably no adjustment is available. Certainly none shown.

I knew that that it would feel draggy due to the magnetic field. It was the amount of resistance that threw me for a loop. I didn't expect it to have as much resistance as it has.

Dynamo wheels do feel like they must have a ton of resistance. But when off, they are ultimately need about 1 watt more energy to spin. On, about 6-8 watts. Consider that a fit cyclist puts out about 200 watts, it's hardly significant.

Well I finally got it all together. I got the wheels built Monday night and got the Supernova e3 today.
On the short test run it was nice and bright on the MUP. I can't wait to get out on the dark country roads.

More Pictures Here

Per a Wikipedia article that quotes from a German test the SRAM hub dynamo is actually more efficient than the Schmidt SON 28, at least at the measured speed.

https://en.wikipedia.org/wiki/Hub_dynamo

Yes, the article says the S-RAM (66%) is 10% more efficient than the SON (65%).....

^^ That claim and the fact that it also had cartridge bearings were the two big factors that led me to purchase the SRAM hub. I am real pleased with it so far. Now the test is the longevity of it during all sorts of weather.

After my first ride after I built the wheels the hub loosened up a bit. And after I installed the light there is real difference between not having the light on vs. having it on (on the stand at least), not a big one but you can tell. However when riding you can't tell anything. I think I will be real pleased with this setup until daylight savings comes around again.

^^ +1

The price is right, too!

Do you guys have any idea what kind of Lux output these have compared to the B&M lights? The reason I ask is that they're much more expensive, and for 2-3 times the price, is it worth the money?

Do you mean the Supernova e3 light mentioned above?

Here are a series of comparison photos of various headlight beams from the Peter White Cycles web site including the e3 and the IQ Cyo lights.

https://www.peterwhitecycles.com/headlights.asp

The IQ Cyo has a considerable dark area immediately ahead of the front wheel. The Cyo R is better in this respect but you can judge the photos for yourself. Note that there are now multiple models of the e3 light with different beam shapes.

Correct, the dynamo version of the E3.

Thanks, probably 20 minutes after I posted this, I went back and re-searched the Peter White site, as he seems to have the only real comparison data on several lights.

I did see the lenses for the E3, and after I went back and re-read the specs and data, it looks like the B&M IQ Cyo puts out 90% of the light, for 50% of the cost. And you can get it with two different lenses, as well. I think I know which way I'm leaning.

I bought the Supernova e3 symetrical because I wanted a light that would display the road signs also and the assymetrical didn't look like that would do it very well. I also choose the e3 over the LightOn! because of the 5yr warranty and the fact that I could upgrade it later, either to a new single LED, or even to the triple LED system for (at the present prices) less than you could purchase the current triple for.

I had my first test ride last night (55 miles on dark back county roads in the woods) and while it isn't as bright as a floodlight the difference between this and battery lights is tangible. The difference between this light and a "to be seen" light is the fact that the light doesn't wash out due to streetlamps, or after oncoming car headlights pass you (I always had a problem picking the line back up after a car passed me, not anymore) Also cars actually dimmed their lights when approaching from a further distance away so I didn't get blinded by them. The only problem I have is with the skewer mount and that is because the front wheel throws a shadow going about 20 degrees to the left. On a straight road this isn't a problem but on a sweeping left hand turn you tend to drive into the dark spot. Other than that I wouldn't change my light choice.

I will probably upgrade in the next year or two to the triple light. As much light as the single e3 puts out I would still feel more comfortable on the road with more light. But I have to admit that this is probably adequate for my needs. I would not want any less light so I am glad I didn't go with the B&M lights.

I wish I knew someone around here that had the LightOn light because I like the Hi/Lo switch and it would be nice to make a personal comparison.

canopus;

I just installed the Light On! dynamo light on one bike. Now I need to try it out on a truly dark road as it is hard to judge light output on roads with street lights. I came down with a cold the morning after finishing the installation though so it may be a few days before I do any more night riding.

As noted on the Light On! web site the light does not reach full output until you are moving fairly fast. In that respect the IQ Cyo is better for in town use IMO as it is at full output at 5 MPH or less. The Light On! light acts more like a pair of normal dynamo lights hooked up in series per what I have read.

Sorry that we are about 1000 or more miles apart.

Don't get me wrong, the light output on my e3 is really nice, especially on dark roads. I think my desire for more light has more to do with my age than anything else. I am at that precipice, where the eyes start playing tricks (dang I hate forty-itus). The light showed everything on the road in my path very well and even the surrounding forest enough that if a deer was there I would see it. And the junk that litters the shoulders was easy to spot and avoid, even identify from 20 feet out.. I even caught some of the glass on the road that I would always miss at night.

Sorry about your cold. I am still trying to build my mileage back up after two weeks off with knee issues.
I did not like being off the bike that long.

That is one nice thing about the e3, it reaches full brightness almost at walking speeds.