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  1. P

    Helmet light for cycling

    Hello guys ! I'd have preferred to DIY this, but I don't see how to build a proper waterproof housing... do you guys know any light that would be : - helmet mountable - as light as possible - runs off one 18650 cell (my dynamo system recharges those) - has a red light at the rear...
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    Ultimate dynamo light - make a wish

    > Is there any particular reason for the PCB being that huge? Yeah, the PCB has 2x 18650 Li-Ion cell holders, and 1 big capacitor (since dynamo can go down to 10-20 Hz and the flickering is really annoying) which basically determine the size. Therefore, I didn't try to miniaturize stuff too...
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    Ultimate dynamo light - make a wish

    > do you have a front rack? No, I don't have the mounting points on the bike. I've had handlebar baskets, but they all ended up breaking, since this method of one-point fastening cannot work reliably... > For a device that large, mounting to the rack would allow a solid > mounting location...
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    Ultimate dynamo light - make a wish

    > how big are the batteries, and how big will this whole light system be? It should be able to get you home always, so I set the battery design target to a 4 hour climb at very low speed, not using the dynamo. So, one of those ...
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    Ultimate dynamo light - make a wish

    I am also wondering about something -- wether I should split the circuit in two or not. Option 1 : all in the same box, probably located on the front of the diagonal tube of the bike, close to the dynamo and LED. - cons : less room for batteries (2 cells only), not modular - pros : small...
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    Ultimate dynamo light - make a wish

    The optics in this philips look pretty good, but the price is just lol. Anyway I just checked the datasheets and the XP-G and Seouls have about exactly the same light distribution versus angle. What makes the difference in beam quality is that the XP-G is much closer to the PCB than the Seoul ...
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    Ultimate dynamo light - make a wish

    Yeah, but since it's a bit violent I use it mostly at intersections, when the guy should yield, that makes sure he sees me. Also I've noticed bright clothing gets you more respect during the day. Originally I wanted to put everything on top of the front wheel, but after some tests it appears...
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    Ultimate dynamo light - make a wish

    With the same lens the XP-G gives a wider beam than Seoul, and with some lenses, better, with others, worse. I've bought an assortment of lenses. Up until low I have tested them for like 10 minutes so I can't give you precise details !... Also where you mount the light has a lot of importance...
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    Ultimate dynamo light - make a wish

    Yo guys. I'm fed up with my battery powered lights : the battery is always dead at the wrong time, it's heavy (especially the helmet light one)... I want a light that's always ready no matter what, even below 0°C when batteries give up, or after a few days of camping with no power to charge...

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