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#31
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New B&M 100lux headlight.
On 03/12/17 15:02, Oculus Lights wrote:
On Tuesday, November 21, 2017 at 2:34:34 PM UTC-8, James wrote: https://www.bike24.com/p2144878.html -- JS B&M plays the lux only racket. But their lights are poor lumens/lux ratio. Lux only says the intensity at the brightest point anywhere in the beam. No mention if this is STVZO or not. Best guess is that it isn't. My STVZO working concept is more efficient than any STVZO beam currently on the market. It would need 18 watts for 100lux STVZO, and even that would probably not be able to stay under 2 lux on the horizon. ~65 lux at ~9 watts making 650+ lumens is about the ceiling for a single LED STVZO compliant light. Nah, they just have a more intricate beam shape than ol' flood light Barry. -- JS |
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#32
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New B&M 100lux headlight.
On Tue, 05 Dec 2017 17:24:28 -0600, Tim McNamara
wrote: On Mon, 4 Dec 2017 20:19:24 -0800 (PST), Sir Ridesalot wrote: On Monday, December 4, 2017 at 10:47:49 PM UTC-5, Tim McNamara wrote: snip Not bright enough and you don't see well enough; too bright and you don't see well either because near objects are too bright and interfere with dark adaptation. Too narrow causes the same sort of problem. The top of the beam should be brighter than the bottom. Some scatter to the sides is helpful, scatter above the horizon is not (I notice even my new Subaru has a sharp upper cutoff to the headlight beams). It's easy to get into thinking that brighter is always better, in which case one will ultimately ride only during the day in full sun. And even then there are those who believethat you MUST use super-bright flashing lights in the daytime. I'm not that overcautious, but I get the notion given the complete obliviousness of about 1/4 of the car driving population. They're looking at their phones, eating lunch, drunk, stoned, whatever. Anything but responsible behind the wheel. What puzzles me are the folks who only use a flashing light as a headlight in full darkness. WTF is up with that? What I like to see on a website is an image of the ACTUAL BEAM PATTERN on the road not a wall. Hence my reference of Peter White's page of beam photos. There are some other collections of beam photos out there on the interwebs. The challenge is setting the camera so that it sees approximately what the human eye does, not making the beam falsely bright or falsely weak. I've always thought that all the discussion about Lummins, luxes, and whatever else, ignores what I suggest may be the most important fact, the ambient light. In a situation where there is no light, where one literally cannot see one's hand in front of their face, lighting a match provides a truly amazing amount of visibility. I've also noticed the reverse phenomena driving on roads with large overhead lighting. Gee, can hardly see any light from the headlights. I've always wondered about where people take the photos that they publish showing beam coverage :-) Deep in the jungle, on a moonless night, a candle and the mirror in your wife's Compact will show an amazing beam pattern :-) -- Cheers, John B. |
#33
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New B&M 100lux headlight.
On Wednesday, December 6, 2017 at 12:49:38 AM UTC+1, sms wrote:
On 12/5/2017 11:58 AM, Tosspot wrote: On 03/12/17 22:35, Andre Jute wrote: On Sunday, December 3, 2017 at 10:39:17 AM UTC, Tosspot wrote: On 03/12/17 05:02, Oculus Lights wrote: On Tuesday, November 21, 2017 at 2:34:34 PM UTC-8, James wrote: https://www.bike24.com/p2144878.html -- JS B&M plays the lux only racket.Â* But their lights are poor lumens/lux ratio.Â* Lux only says the intensity at the brightest point anywhere in the beam.Â* No mention if this is STVZO or not.. Best guess is that it isn't. https://www.bumm.de claim it is StVZO compliant. You guessed wrong, Barry. I would be exceedingly surprised to discover that any BUMM lamp is not StVZO compliant. That is BUMM's USP or unique selling point and has always been. It is precisely this StVZO compliance that makes their lamps inferior to yours in output and superior to yours in beam shaping. Who the **** is Barry? Barry manufactures the Oculus light, a very nice battery powered, self-contained, 1800 lumen battery powered light, and now there is a 3000 lumen model. Very well designed beam that doesn't suffer from the limitations of most dynamo lights. but still is a battery powered light with the drawback of their limited running time which is the main reason for the people using dynamo lights not to chose for that option. Lou |
#34
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New B&M 100lux headlight.
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#35
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New B&M 100lux headlight.
On 04/12/17 17:33, sms wrote:
On 12/3/2017 5:21 PM, Tim McNamara wrote: On Sun, 3 Dec 2017 16:56:24 -0800, sms wrote: On 12/3/2017 4:28 PM, Oculus Lights wrote: On Tuesday, November 21, 2017 at 2:34:34 PM UTC-8, James wrote: https://www.bike24.com/p2144878.html -- JS Is there a power rating?Â* 100 lux at 10 meters, as the STVZO test requires, is exceedingly bright.Â* I'm hesitant to state they "must" be drawing at least so much power, but my gut feeling is that its in a range that a single LED can't handle. Anyone can rate a light without stating the distance.Â* My single LED 325 lumen measures 33 lux at 10, 500+ lumen measures 50 lux, and the best of the others on the market, such as Supernova's 205 lm that's standard equipment on many e-bikes, measure 25 lux at 10 meters, at most. It's not all that new, and it's not very well rated. The complaints I saw are a) the beam shape is too narrow, and b) the standlight is inadequate. Neither is surprising. Dynamo lights make trade-offs, and one major one is concentrating the limited available output into a narrow beam, which is a big compromise in terms of safety, both in seeing and being seen. The second is that the standlight is necessarily fairly weak because the internal battery or super-cap can't provide enough power. The only suitable dynamo light for use in the U.S., in a dynamo-only configuration, remains the Supernova E3 Triple 2. It has a proper beam, and is not StVZO compliant for on-road use in countries where StVZO compliance is mandatory. Have you even looked at beam pictures? Yes. The criticism was valid. Here is what the review stated: "The beam is too narrow In focussing all the output from the LED directly ahead to hit that magical 100 lux figure, B&M have made something akin to a laser… If it’s outside a narrow degree arc from the front, it’s going to be near invisible. Two examples. Take a standard lane-in-each-direction road, in complete darkness. If you’re cycling in the centre of the left-hand lane with the IQ-X, you may not see a road joining on your right as almost no light will reach the opposite verge. Or, take a winding single-lane road. As you lean the bike to take a right-hand bend, the right side of the beam dips too, and you cycle into complete darkness. I’ve often praised the way German light manufacturers make the best use of every photon by focussing the output into useful areas. With the IQ-X, B&M have gone too far." from https://www.darkerside.org/2017/02/bm-iq-x-dynamo-headlight-review/ That's on a recumbent. It is far lower than the light is designed for. Even on my Bullit I had to bodge higher mounts as the crown mount made the EYC useless. Mounted higher it's fine. |
#36
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New B&M 100lux headlight.
On 12/6/2017 9:46 AM, sms wrote:
I'm sure we'd all run out and buy a dynamo light if it was possible to build one that was adequate for the riding conditions we experience. Unfortunately it isn't yet possible to build such a dynamo light. So how do you explain the several people here who have ridden successfully with only dynamo lights for decades? -- - Frank Krygowski |
#37
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New B&M 100lux headlight.
On Wednesday, December 6, 2017 at 11:58:53 AM UTC-8, Frank Krygowski wrote:
On 12/6/2017 9:46 AM, sms wrote: I'm sure we'd all run out and buy a dynamo light if it was possible to build one that was adequate for the riding conditions we experience. Unfortunately it isn't yet possible to build such a dynamo light. So how do you explain the several people here who have ridden successfully with only dynamo lights for decades? Excellent night vision? Brightly lit streets? Full moon? I need all the light that I can get when riding the gnarly single-track on my way home, being chased by cougars. https://i.ytimg.com/vi/jgFVixm_e1c/hqdefault.jpg -- Jay Beattie. |
#38
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New B&M 100lux headlight.
On 12/6/2017 12:58 PM, jbeattie wrote:
On Wednesday, December 6, 2017 at 11:58:53 AM UTC-8, Frank Krygowski wrote: On 12/6/2017 9:46 AM, sms wrote: I'm sure we'd all run out and buy a dynamo light if it was possible to build one that was adequate for the riding conditions we experience. Unfortunately it isn't yet possible to build such a dynamo light. So how do you explain the several people here who have ridden successfully with only dynamo lights for decades? Excellent night vision? Brightly lit streets? Full moon? I need all the light that I can get when riding the gnarly single-track on my way home, being chased by cougars. https://i.ytimg.com/vi/jgFVixm_e1c/hqdefault.jpg -- Jay Beattie. For seeing add: familiar roads, slower speeds For being seen add: A large amount of luck, better drivers Also remember that many of the people posting the virtues of dynamo lights live outside the U.S., many in places with far better bicycle infrastructure and more enforcement of traffic lights. Some live in countries where high-quality bicycle lighting, with proper optics, is illegal. |
#39
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New B&M 100lux headlight.
On Wednesday, December 6, 2017 at 3:20:50 PM UTC-6, sms wrote:
On Wednesday, December 6, 2017 at 11:58:53 AM UTC-8, Frank Krygowski wrote: So how do you explain the several people here who have ridden successfully with only dynamo lights for decades? Also remember that many of the people posting the virtues of dynamo lights live outside the U.S., many in places with far better bicycle infrastructure and more enforcement of traffic lights. Some live in countries where high-quality bicycle lighting, with proper optics, is illegal. I live in the USA. Not too far from the middle of the contiguous portion. I rode OK with a dynamo and two halogen bulbs for several years. Rode PBP in 2007 with that setup. PBP is in France. It was very RAINY during the night on that PBP. Somehow I made it OK. Then I got modern and put two LED lights on the bike. WooHoo. It was an improvement over halogen bulbs. Wasn't night and day improvement though. |
#40
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New B&M 100lux headlight.
On 12/6/2017 4:20 PM, sms wrote:
On 12/6/2017 12:58 PM, jbeattie wrote: On Wednesday, December 6, 2017 at 11:58:53 AM UTC-8, Frank Krygowski wrote: On 12/6/2017 9:46 AM, sms wrote: I'm sure we'd all run out and buy a dynamo light if it was possible to build one that was adequate for the riding conditions we experience. Unfortunately it isn't yet possible to build such a dynamo light. So how do you explain the several people here who have ridden successfully with only dynamo lights for decades? Excellent night vision?Â* Brightly lit streets? Full moon?Â* I need all the light that I can get when riding the gnarly single-track on my way home, being chased by cougars. https://i.ytimg.com/vi/jgFVixm_e1c/hqdefault.jpg -- Jay Beattie. For seeing add: familiar roads, slower speeds For being seen add: A large amount of luck, better drivers Ah yes. If you haven't died, it's because you were so brilliant in your personal choice of equipment. If someone else hasn't died, it's only because they are lucky. Gosh, hardly any bias there! My headlights have more than sufficed on familiar roads, on unfamiliar roads, on roads in other states and roads in other countries. And as I've mentioned many times, I've gotten spontaneous compliments on my lights from motorists and from pedestrians. Many of those compliments were back in the halogen bulb days, powered (as they are now) by dynamos. Also remember that many of the people posting the virtues of dynamo lights live outside the U.S., many in places with far better bicycle infrastructure and more enforcement of traffic lights. Some live in countries where high-quality bicycle lighting, with proper optics, is illegal. Far better infrastructure like the ordinary rural roads of Brittany, where they run Paris-Brest-Paris, and where randonneurs who have never before been there ride all night, many using dynamo lights? You're daft. I've ridden in about a dozen foreign countries. Almost all of that has been on ordinary streets and roads. It's pretty ignorant to believe or pretend that all of Europe has kiddie tracks along every road. -- - Frank Krygowski |
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