Recent content by markus_i

fenix-store
  1. M

    Best bike light?

    Ok, so if I'm flying off on the wrong tangent, just ignore me, but: have you considered a dynamo light? At your price bracket, the SON/Edelux combo (considered 'best bikelight' by many who do long distance commuting and/or touring) is out, but you should be able to fit in: - Shimano/Sanyo/SRAM...
  2. M

    Ultimate dynamo light - make a wish

    Check the Philips LED bike light (see corresponding thread) for a light with a good LED/reflector combination. The usual LED reflectors/optics are next to useless for on-road cycling - both thanks to blinding the oncoming traffic and for wasting half of the light where you can't use it. Area is...
  3. M

    Philips LED bike light

    Update: Dynamo driven battery chargers were a central theme in the last two issues of the German online bike magazine 'fahrradzukunft' (http://www.fahrradzukunft.de/). One of the best systems (surpassing even the e-Werk) was the 'Forumslader' (http://www.forumslader.de/), a communal project from...
  4. M

    Is it possible to run a dynamo-based LED light from a battery pack?

    Maybe less, actually: The light sells for 100 Euros. Deduct 20% (actually 19%, but keep it simple) German VAT (see footnote 2 on the shipping cost page - all advertised prices in Germany have to include VAT), add 20 Euros shipping for a total of 100 Euros, which is currently 130 USD. Add your...
  5. M

    Philips LED bike light

    I've been thinking about that one, too. From the data, it looks like the LEDs are getting at most 1 A (probably more like 0.8 A - let's wait for the results from the runtime test) from the batteries in high power mode, so there are several possibilities, unfortunately most of which involve...
  6. M

    Hello, may I forward your information/link regarding the Philips light to the German bike light...

    Hello, may I forward your information/link regarding the Philips light to the German bike light mailing list (in German: http://tandem-fahren.de/mailman/listinfo/rad-licht )? I think this sstuff may be interesting, especially since the Philips light is practically unknown so far. Bye Markus
  7. M

    Need an underground light

    Since others already talked about the reliability of your main light... first, I'd assume (I'm no caver myself) that like with diving you're never caving alone, so even if your primary and backup fail, you're not immediately endangered. If your primary light is sufficiently reliable, you'll...
  8. M

    Laser recommendations for High School Classroom

    Depends on what type of optics you want to demonstrate. For plain geometrical optics, go with anything in the near red or green spectrum that is safety approved for in-classroom use in your area and provides some means of securely mounting it to your optical bench. I doubt that the 20 mW green...
  9. M

    Lights for Alleweder Velomobile

    Re: Lights for Alleweder Velomobiel Purely theoretical, but I'd be cautious not to illuminate the nose cone itself through spill from the helmet/mirror lights. Even a little bit of stray light in front of your nose can seem pretty bright and at least decrease your night vision if there's...
  10. M

    2AA Fenix as backup to a generator hub?

    - Hubs generate ~500 mA. The LEDs in the b&m and Schmid lights are driven with a little less than the double of what the hub delivers, since they contain a driver circuit. - Overall efficiencies vary highly, I wouldn't go as far as estimating a mere factor of two just from theory - and that...
  11. M

    Best AA Bikelight?

    Under $50, LEDs, AA, removable? The problem is that you won't find something that's designed as a flashlight with a decent beam profile for on-road riding. Multiple levels won't help you that much either, the problem is that you'll have to flip the beam down simultaneously (or instead). The...
  12. M

    Let's design a road front light beam

    Just one thought: the SON generator will produce 500 mA nominal, almost independent of the speed, and deliver ~0.6V/(kph) if mounted in the correct size wheel (~1V/kph if you use the 26" generator in a 20" wheel...). A simple and good solution is to use the SON as intended, driving a Schmidt...
  13. M

    Bicycle Lighting

    A 'good bicycle lighting solution' for which usage profile? Since you're in Europe, you'll have easier access to some high quality bike light systems than on the other side of the pond (i.e. you won't need to make do with some flashlight taped to the handlebar), so maybe it would be beneficial...
  14. M

    Inside B+M IQ Fly Senso Plus

    Two possiblities: a) (most likely): losses. The doubler uses a simple (read: cheap) circuit that has some potential for optimization. Since we're running only at 3.5 volts, even the losses on the (Schottky?) rectifier diode become significant. Other potential losses: inductor resistance...
  15. M

    Inside B+M IQ Fly Senso Plus

    Forget about the boost cap. The electronics inside the light already does a (roughly - minus losses) unregulated 1:2 current transformation for the LED. Being unregulated, this becomes dangerous if you exceed the usual 500 mA generator current (or connect a DC source > 2* LED forward voltage)...
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