#31
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#32
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On Mon, 6 Mar 2017 16:57:41 +1100, James
wrote: What if I don't want to play with batteries? Then play with calcium carbide (produces acetylene gas) instead: https://www.google.com/search?q=acetylene+bicycle+lamp&tbm=isch -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#33
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On 3/6/2017 9:37 PM, sms wrote:
This light http://supernova-lights.com/en/supernova-e3-triple-2 claims 640 lumens at 4.5W. 4.5W is definitely possible from a nominal 3W dynamo. It claims 800 lumens peak. Note that his light, while sold in Germany, is not "road legal." because, according to reviews, it doesn't suffer the problems of StVZO lights, "It has a very broad light output that is closer to a floodlight than a focused beam, and so doesn’t give the ‘tunnel’ effect of some of the powerful battery-powered lights. This means it’s great for illuminating branches and hazards above you and off to the side." As we all know, the problem with StVZO legal lights are related to the extremely focused spot beam. Here's an example of an StVZO headlamp (2013 model) with the "extremely focused spot beam" the Scharf complains about. http://peterwhitecycles.com/images/p...lux-II-800.jpg See that tiny spot? ;-) -- - Frank Krygowski |
#34
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On Mon, 6 Mar 2017 23:11:26 -0500, Frank Krygowski
wrote: Here's an example of an StVZO headlamp (2013 model) with the "extremely focused spot beam" the Scharf complains about. http://peterwhitecycles.com/images/p...lux-II-800.jpg See that tiny spot? ;-) Here's the same photo with brightness converted to pseudo colors: http://802.11junk.com/jeffl/pics/bicycles/Front-Light-False-Color/sch-edelux-II-800.jpg No obvious hot spot. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#35
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never experiencing dyna lighting, the White photo bears no relation to anything I've read here.
I aaside the cycle is moving at 35 mph. |
#36
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On Tuesday, March 7, 2017 at 5:11:29 AM UTC+1, Frank Krygowski wrote:
On 3/6/2017 9:37 PM, sms wrote: This light http://supernova-lights.com/en/supernova-e3-triple-2 claims 640 lumens at 4.5W. 4.5W is definitely possible from a nominal 3W dynamo. It claims 800 lumens peak. Note that his light, while sold in Germany, is not "road legal." because, according to reviews, it doesn't suffer the problems of StVZO lights, "It has a very broad light output that is closer to a floodlight than a focused beam, and so doesn’t give the ‘tunnel’ effect of some of the powerful battery-powered lights. This means it’s great for illuminating branches and hazards above you and off to the side." As we all know, the problem with StVZO legal lights are related to the extremely focused spot beam. Here's an example of an StVZO headlamp (2013 model) with the "extremely focused spot beam" the Scharf complains about. http://peterwhitecycles.com/images/p...lux-II-800.jpg See that tiny spot? ;-) -- - Frank Krygowski That is the headlight I use and it looks exactly the same on a pitch dark street. So again I don't understand why people find this amount of light insufficient. Lou |
#37
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On Mon, 6 Mar 2017 11:15:54 -0800 (PST), jbeattie
wrote: On Sunday, March 5, 2017 at 9:57:44 PM UTC-8, James wrote: On 06/03/17 10:22, Barry Beams wrote: Burn time: What if you had five or ten hours battery time at your generator's brightness? My Oculus gives at least that much brightness, and a quickly field replaceable battery so you can put in a fresh battery. Other rechargeables leave you out of light and out of luck when the battery drains. Oculus also comes with a spare battery included. What if I don't want to play with batteries? Then you're done with the battery light discussion and may move on to helmets. -- Jay Beattie. I thought that chain-lube was next on the agenda? -- Cheers, John B. |
#38
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On Mon, 06 Mar 2017 20:10:21 -0800, Jeff Liebermann
wrote: On Mon, 6 Mar 2017 16:57:41 +1100, James wrote: What if I don't want to play with batteries? Then play with calcium carbide (produces acetylene gas) instead: https://www.google.com/search?q=acetylene+bicycle+lamp&tbm=isch Ahem! I don't think you should suggest acetylene gas devices to some of the folks here. After all the safe limit for acetylene gas is 15 psi, above which it tends to go BOOM! :-) (but maybe if you wear a helmet and have a bright light... :-) -- Cheers, John B. |
#39
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On 2017-03-06 20:00, Frank Krygowski wrote:
On 3/6/2017 4:33 PM, Joerg wrote: The real McCoy would be a worryfree system like in a car where it recharges while riding. If I ever switch the road bike front wheel to one with a hub dynamo I will do that. Right now it only has a bottle dynamo, too much drag and it eats the left side wall of "modern" tires. I've done well with a bottle dynamo whose drive wheel has an added circumferential groove to hold a thick O-ring. That O-ring runs on the rim's braking surface, not on the tire. Zero tire wear, and it runs very smoothly. I've experienced no slipping - but it's not been tested in the rain. May main issue isn't rain but mud. Often the Soubitez bottle dynamo on my road bike mutates into a clump of drying clay. Back in Europe slush and ice was the main issue. Typically on a night ride back home when a cold front rushed in. The slush accumulated at the dynamo, gradually froze up there and at some point ... phseeeee ... no more light on our bikes except on mine because that had a battery. -- Regards, Joerg http://www.analogconsultants.com/ |
#40
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On Tue, 07 Mar 2017 20:00:47 +0700, John B.
wrote: On Mon, 06 Mar 2017 20:10:21 -0800, Jeff Liebermann wrote: On Mon, 6 Mar 2017 16:57:41 +1100, James wrote: What if I don't want to play with batteries? Then play with calcium carbide (produces acetylene gas) instead: https://www.google.com/search?q=acetylene+bicycle+lamp&tbm=isch Ahem! I don't think you should suggest acetylene gas devices to some of the folks here. After all the safe limit for acetylene gas is 15 psi, above which it tends to go BOOM! :-) I once found a patent for an acetylene lantern design that used the heated gas pressure from the burning acetylene to pressurize a reed and thus act as a horn. I don't recall if it had a built in red tail light. What keeps an acetylene lantern from blowing up and ruining a ride is that the drip of water into the calcium carbide chamber is regulated by the back pressure produced by the reaction. No water means no gas is produced. It's a gravity fed affair, that's quite reliable and should never raise the internal pressure anywhere near 15 psig. (but maybe if you wear a helmet and have a bright light... :-) The light isn't for me. It's for James who wants an alternative to changing batteries. I solved my lighting problem long ago: http://802.11junk.com/jeffl/pics/bicycles/slides/bicycle-flashlight.html The big problem with an acetylene bicycle lantern is that a typical lantern only delivers about 30 to 50 lumens (my measurements). If you need a project, build an acetylene lamp that screws into an aluminum water bottle. http://www.4bobandbob.com/pages/pics/PremierDia.gif -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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