Hello -
This is my first post here. I'll apologize straight away for this lengthy, multi-pronged response, but hope it will be helpful for others out there researching similar bicycle lighting topics.
As I stumbled upon this thread, I was actually searching for some comparisons between the 1203D and the "to be released November 2007" updated Supernova E3. I still have not found any thorough comparisons between the 1203D and the 1st generation E3. If someone has experience here, please share!
One of my bicycles is a Rohloff-equipped Surly Long Haul Trucker with a Schmidt Dynohub. I use it year round for pretty much everything from commuting to work, organized events, to week long tours. I live in the Midwestern US where I ride year round on a great variety of roads, gravel and paved tracks, and single track hiking trails. Besides the dynamo system below, I also have a Niterider 12+20 watt battery-powered system that I use for different types of rides.
For one year now on the Surly, I've been using a B&M D'Lumotec Oval (LED version of the Lumotec Oval) as my primary, along with a Schmidt E6-Z secondary. The D'Lumotec is mounted on my fork crown, and the E6-Z under my handlebar. I still have an E6 under my workbench, but there were good reasons for me to find an alternative with different characteristics for the primary light on my bike...
I specifically wanted better low speed lighting, softer beam cutoff, and better corner illumination for narrow tracks or tight corners. The E6 has such a narrow focus and sharp cut-off to the periphery that I could not see well to the sides, especially whenever things got slow and twisty.
As an all-rounder, this D'Lumotec and E6-Z combination works great for me. As a primary, the D'Lumotec provides useful light on low speed climbs, and provides a smoother and somewhat broader spill of light to the sides for navigation (when compared to E6). As speed increases, the E6-Z comes online as my "high beam," projecting it's good distance beam up the road ahead.
The D'Lumotec's LED starts to provide useful light at a walking pace and quickly reaches 100% output thereafter - something the E6 cannot match. On straight stretches of highway, this D'Lumotec + E6-Z combo still continues to be my preference over an E6 + E6-Z due to the whiter light color rendered by combining these together, as well as the complimentary combination of their beam patterns.
B&M's D'Lumotec Oval has a well-designed beam pattern with decent projection down the middle along with a nice and smooth transition to the sides. The version I have has a good standlight. The negatives for the D'Lumotec Oval are the cheesy on/off switch, and heavier weight when compared to an E6.
For anyone inclined to mix and match lights...
There is difference in electronics between the E6-Z and E6. The E6 does not work "well" as a secondary. (I tried them both as a secondary to the D'Lumotec... The E6-Z provides useful light as a secondary around 11 mph, whereas the E6 as a secondary did not provide useful light until 16+ mph.)
I purchased the Inoled 2 watt version before much was known about them. I (like a few others) thought it could be used as a primary with another headlight as a secondary. However this was not the case - it didn't work properly. But in any case I personally did not like the wide and flat beam pattern or sharp cutoff out on the road. My dealer kindly took it back.
As for further evolution, I would love to try Solidlights’ 1203D. I've been in contact with Solidlights and was very impressed with other's comments about the lights and service. But being in the US would make any returns to the UK for service or upgrades a serious inconvenience. I haven't found anyone in the US Midwest with a 1203D to check out myself. I also sense that the 2nd generation Supernova E3 will be the top dog, both from an output and aesthetic point of view. Since the E3 is designed to conform to Germany's laws, does this mean surplus dynamo power might be available to run an E6-Z secondary??? Hmmm.
I've been a long-time fan of high-power LEDs, having made many of my own LED headlights in the past 12 years. Now they are mainstream, cheaper, and the output color and power continue to improve. The electronic controls and power regulation are now beyond my capabilities for garage engineering. I believe the LEDs are slowly going to obsolete filament (e.g. halogen) and arc (e.g. HID) options for bicycling purposes as the future unfolds. The 2nd generation NiteRider MiNewt and E3 are examples of this trend.
Not to mislead anyone, the D'Lumotec + E6-Z set-up is completely inadequate for MTB-type singletrack trails, especially in really curvy stuff. Bring a helmet mounted light for these conditions. I’m still looking for the ideal dynamo-powered system that can tackle these conditions.
For what it's worth, I have been running a Princeton Tec EOS camping-style headlight on my helmet to supplement the bike-mouned lighting on my bikes. I removed the EOS' stock elastic band and attach it through vents to my helmet using a short length of 3/4" nylon webbing with a Nexus ladder lock buckle sewn onto one end of the strap. Quick on and off, and solid on my Giro Atmos.
The EOS is unfortunately not dynamo-powered, but it is inexpensive, tiny, sturdy, and surprisingly powerful. It gets good runtime from the 3 AAA batteries, and has a 1 watt LED with an excellent beam pattern for cycling (unlike other camping headlights I've tried such as Petzl's Tikka XP). There are for modes of operation: High, Med, Low, Strobe.
Princeton Tec EOS' regulation is superior to other brands I've tried, extracting maximum power from the little batteries and tolerating anything from Energizer Photo Lithium AAA's to NiMH rechargeables without issue. My example is over three years old and has held up to regular use and frequent battery swaps very well.
I recommend an EOS for the tremendous versatility it adds (think... Need more light to read road signs? Need to fix a flat? Find a spot to rest?). If you already have a dynamo system, this is way more useful than supplemental handlebar-mounted battery lights that I see others using (Cateye, etc.).
Relavent links:
<http://www.bumm.de/index-e.html>
<http://www.nabendynamo.de/> (for Schmidt's company page)
<http://www.solidlights.co.uk/>
<http://supernova-lights.com/index_de.html>
<http://www.princetontec.com/>
NOTE: For anyone interested in the Inoled, read about them on Peter White's web site: <http://www.peterwhitecycles.com/lightingsystems.htm>)
Thanks to everyone here for sharing their info. I hope this was helpful!