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#11
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new light technology
On 3/14/2017 11:33 PM, Barry Beams wrote:
On Tuesday, March 14, 2017 at 6:27:10 PM UTC-7, AMuzi wrote: Claims 'projector' lensing as opposed to 'reflector' lensing. I don't know http://www.herrmans.eu/start-english...?familyId=2209 -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 ~200 lumens seems to be the STVZO physical limit for 1 led with any other approach than mine, and that still doesn't say what the distribution is. I'm at 500+ so far filling out the whole STVZO beam target almost evenly, in a smaller space making the same or less heat. What's their price? It's about $70. Must be ordered from Europe. I saw it at Interbike and it was pretty impressive for a dynamo light in that price range, but of course it can't compare with a battery powered light. I have on. The beam is definitely StVZO poor. I just got it and I haven't used it on the road yet. I hooked it up to a 6VAC supply in my lab. It's decent. Not something to write home about, but good enough to use in some conditions. The wire was too short to reach the dynamo from the handlebars, and I could not mount it to the brake bolt because the front rack is in the way, and while I could have mounted it to the front rack, it's too low (this is on a Dahon folder). I added some wire and a connector pair. |
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#12
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new light technology
Thanks, Doug. Let my autospeller know too, would you. -- AJ
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#13
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new light technology
On 3/15/2017 1:48 PM, sms wrote:
On 3/14/2017 11:33 PM, Barry Beams wrote: On Tuesday, March 14, 2017 at 6:27:10 PM UTC-7, AMuzi wrote: Claims 'projector' lensing as opposed to 'reflector' lensing. I don't know http://www.herrmans.eu/start-english...?familyId=2209 -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 ~200 lumens seems to be the STVZO physical limit for 1 led with any other approach than mine, and that still doesn't say what the distribution is. I'm at 500+ so far filling out the whole STVZO beam target almost evenly, in a smaller space making the same or less heat. What's their price? It's about $70. Must be ordered from Europe. I saw it at Interbike and it was pretty impressive for a dynamo light in that price range, but of course it can't compare with a battery powered light. I have one. The beam is definitely StVZO poor. I just got it and I haven't used it on the road yet. I hooked it up to a 6VAC supply in my lab. It's decent. Not something to write home about, but good enough to use in some conditions. The wire was too short to reach the dynamo from the handlebars, and I could not mount it to the brake bolt because the front rack is in the way, and while I could have mounted it to the front rack, it's too low (this is on a Dahon folder). I added some wire and a connector pair. I used it this morning, but it was not dark out. I need to add flashing DRL capability by interrupting the output from the dynamo. Because of the standlight, the DRL will be more like a motorcycle DRL, varying the intensity, but not going all the way off. I've come up with several ways to do this. The simplest will be a reed switch and a wheel magnet but of course the flash rate will vary with wheel speed. But the rate looks about right at around 3 changes per second at 10 mph. |
#14
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new light technology
On Wed, 15 Mar 2017 10:40:29 +0100, Sepp Ruf
wrote: Jeff Liebermann wrote: On Tue, 14 Mar 2017 20:27:09 -0500, AMuzi wrote: Claims 'projector' lensing as opposed to 'reflector' lensing. I don't know http://www.herrmans.eu/start-english...?familyId=2209 More like a lens versus a reflector. There are benefits to both. I'll skip the basics You shouldn't. https://www.youtube.com/results?sear...ry=h-black+pro Mid-field looks too bright and transitions don't look smooth. Not going to buy one. http://www.herrmans.eu/start-english/products?familyId=2209 There are several videos on this light under H-Black Pro. Two of them looked ad agency creations showing mostly how happy the rider looks on his bicycle with its new headlight. If there was a chance to see the beam pattern, it was conveniently obscured by the ad agency by covering it with moving white spaghetti. However, this video looks like a genuine review: "Herrmans H Black Pro - First look" https://www.youtube.com/watch?v=RLaI1Y54gHo The interesting part is that not only does he show the beam pattern on the ground, but at the very end, he estimates that the light produces 230 lumens and 90 lux. If the beam was truly uniform on the ground, then the size of the beam pattern would be: 1 lux = 1 lumen/square-meter 230 lumens / 90 lumens/sq-m = 2.56 square-meters which does seem to match the beam pattern area in the video. However, there's a problem. If you look at the 0:19 on the video, you can guess the range of the light. Based on the distance between the headlight and tail light, I would guess(tm) that the far end of the beam is no further away than twice that distance, or 1.3 meters, which is far to close for a headlight pattern, unless I were dodging potholes in the road. If the beam were elevated properly, so that I could see perhaps 5 meters ahead, the 2.6m^2 pattern area becomes about 16 times larger, or 41.6m^2, and the 90 lux brightness drops to 5.6 lux. This not particularly bad and is my guess(tm) similar to what a commodity 2 watt LED headlight will produce. The beam pattern in the video looks like 3 overlapping circular "spots" of equal diameter. I suspect what the designer was trying to accomplish is provide equal brightness (lux) on the ground. The nearest spot beam gets some amount of light from the lens with a fairly wide beam width. The middle spot gets the same amount of light, but is more tightly focused (narrower beamwidth) and therefore produces the same brightness (lux) on the ground. The most distant far spot gets the same amount of light, but with an even narrower beam, also producing the same brightness. At least that's my guess(tm) as to what was suppose to happen. However, it didn't work, and as you note, the transition areas where the spots overlap are not even brightness with multiple hot spots. It rather reminds me of my experiments with multiple independent LED headlights. The idea was to shape the beam pattern by individually adjusting the position of each LED light. (I didn't go so far as to adjust the intensity of each). With 5 LEDs, I ended up with 5 hot spots. Oops. I still think there's promise to the approach, but it would take considerable cut-n-try tweaking, as Barry Beams has done with his headlight. The advertising for the light claims: "The light pattern is optimized for the rider - super wide, long and homogeneous light distribution (widest on the market)." Well, it's not very wide, judging from the video and from the pattern on the data sheet. http://www.herrmans.eu/start-english/products?familyId=2209 It's also not very homogenous, which I presume means evenly distributed light. That's what I would expect from a film or slide projector, where any brightness irregularities across the projected image would be highly unacceptable. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#15
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new light technology
On 16/03/17 22:36, Jeff Liebermann wrote:
On Wed, 15 Mar 2017 10:40:29 +0100, Sepp Ruf wrote: Jeff Liebermann wrote: On Tue, 14 Mar 2017 20:27:09 -0500, AMuzi wrote: Claims 'projector' lensing as opposed to 'reflector' lensing. I don't know http://www.herrmans.eu/start-english...?familyId=2209 More like a lens versus a reflector. There are benefits to both. I'll skip the basics You shouldn't. https://www.youtube.com/results?sear...ry=h-black+pro Mid-field looks too bright and transitions don't look smooth. Not going to buy one. http://www.herrmans.eu/start-english/products?familyId=2209 There are several videos on this light under H-Black Pro. Two of them looked ad agency creations showing mostly how happy the rider looks on his bicycle with its new headlight. If there was a chance to see the beam pattern, it was conveniently obscured by the ad agency by covering it with moving white spaghetti. However, this video looks like a genuine review: "Herrmans H Black Pro - First look" https://www.youtube.com/watch?v=RLaI1Y54gHo The interesting part is that not only does he show the beam pattern on the ground, but at the very end, he estimates that the light produces 230 lumens and 90 lux. If the beam was truly uniform on the ground, then the size of the beam pattern would be: 1 lux = 1 lumen/square-meter 230 lumens / 90 lumens/sq-m = 2.56 square-meters which does seem to match the beam pattern area in the video. However, there's a problem. If you look at the 0:19 on the video, you can guess the range of the light. Based on the distance between the headlight and tail light, I would guess(tm) that the far end of the beam is no further away than twice that distance, or 1.3 meters, which is far to close for a headlight pattern, unless I were dodging potholes in the road. If the beam were elevated properly, so that I could see perhaps 5 meters ahead, the 2.6m^2 pattern area becomes about 16 times larger, or 41.6m^2, and the 90 lux brightness drops to 5.6 lux. This not particularly bad and is my guess(tm) similar to what a commodity 2 watt LED headlight will produce. The beam pattern in the video looks like 3 overlapping circular "spots" of equal diameter. I suspect what the designer was trying to accomplish is provide equal brightness (lux) on the ground. The nearest spot beam gets some amount of light from the lens with a fairly wide beam width. The middle spot gets the same amount of light, but is more tightly focused (narrower beamwidth) and therefore produces the same brightness (lux) on the ground. The most distant far spot gets the same amount of light, but with an even narrower beam, also producing the same brightness. At least that's my guess(tm) as to what was suppose to happen. However, it didn't work, and as you note, the transition areas where the spots overlap are not even brightness with multiple hot spots. It rather reminds me of my experiments with multiple independent LED headlights. The idea was to shape the beam pattern by individually adjusting the position of each LED light. (I didn't go so far as to adjust the intensity of each). With 5 LEDs, I ended up with 5 hot spots. Oops. I still think there's promise to the approach, but it would take considerable cut-n-try tweaking, as Barry Beams has done with his headlight. The advertising for the light claims: "The light pattern is optimized for the rider - super wide, long and homogeneous light distribution (widest on the market)." Well, it's not very wide, judging from the video and from the pattern on the data sheet. http://www.herrmans.eu/start-english/products?familyId=2209 It's also not very homogenous, which I presume means evenly distributed light. That's what I would expect from a film or slide projector, where any brightness irregularities across the projected image would be highly unacceptable. Take a look at 12s in. Here the light is set up as my IQ-X is, with the top of the beam angle down a few degrees (SvTO cutoffs really help this) and it seems the near field is indeed to close. I should try and film my IQ-X in action, it has a very similar beam pattern, but less delineated. Mind you, twice the price. |
#16
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new light technology
On 3/16/2017 11:27 PM, Tosspot wrote:
Take a look at 12s in. Here the light is set up as my IQ-X is, with the top of the beam angle down a few degrees (SvTO cutoffs really help this) and it seems the near field is indeed to close. I should try and film my IQ-X in action, it has a very similar beam pattern, but less delineated. Mind you, twice the price. Since I am likely the only person in the U.S. with the Herrman's light, I will try to take a video this weekend of it. |
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