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#362
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Lezyne Deca Drive 1500XXL Report
On 3/4/2017 8:04 PM, James wrote:
snip Google street view images may not be representative of precisely how the shrubbery was when I was using that road. Google street view is definitely not representative. They don't drive down each street continuously. A few years ago I posted some links to photos of low hanging branches and pointed out that the Google street view was very different. Some people might not be aware that trees tend to grow, then they are trimmed. Then they grow. It's a process that requires periodic pruning. Unfortunately, on streets with bicycle lanes or shoulders, you don't get tall trucks knocking down these low hanging branches since the trucks don't drive in those areas. |
#363
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Lezyne Deca Drive 1500XXL Report
On Monday, February 20, 2017 at 12:43:56 PM UTC-8, sms wrote:
With all the rain, last week was the first time we were out at night and I got to see the Lezyne Deca Drive 1500XXL http://www.lezyne.com/product-led-perf-deca1500xxl.php in action on my wife's commute bike. Every time I looked in the mirror I thought that there was a car behind me. This is because she still had her 1300 lumen 4C light on her handlebars as well, even though I told her to leave it at home. The two lights looked about equally bright (The Lezyne light was measured my a reviewer at 1390 lumens, there is no independent measurement of the Duracell light, but they probably don't lie as much as some of the lights coming in from China). This is really an incredible light for the price (now about $92). There are very few lights with this level of output, that don't have fake lumen claims, and that are all-in-one (no separate battery pack), that are not plastic, and that are less than $100. We were off of the unlit MUP before it got completely dark, but I have no doubt that it would been sufficient. I think that I have finally convinced my wife to give up her 4C 1300 lumen light. C cells were getting to be more than our electric bill. On the negative side, the Lezyne light doesn't come on and off as easily as the 4C 1300 lumen light with my custom mount, and it does not have an adjustable spot/flood beam. The mount is also not able to be adjusted for slightly curved handlebars, like the custom mounts I have made for C and AA diameter flashlights. https://www.probikekit.com/cycling-a.../11170762.html 10% discount for first order. Beam Lumens and Field Lumens would be measured with a goniometer. The approach of grafting multiple round beams can construct a large light field, but consuming much more power, generating much more heat and glare, and needing a larger, heavier housing. My optics are unique, in that I create an even beam with less power consumption, glare, and wasted rays, in a smaller volume than other approaches. No one else is working on my basic premise of creating a variable focal line, instead of the traditional optical approach of having a focal point, that the optics are designed to. Read my patent if you want to try to get some concept of my intersecting, not necessarily concentric or parallel, light source and reflective cylinder approach. Take the word "cylinder" in its broadest mathematical definition here. I didn't start out trying to think about how to do it, only spent obsessive amounts of time bouncing light rays around in my mind trying to inductively figure out how to go backwards from the kind of beam I wanted to create, inductively to a weird optical layout that could create it. I would have rejected my approach as ridiculous, dumb, and no possible practical use, had I had a conventional education in optics. 10 years ago I was making multiple overlapping aimed round beams that made great light, for its time, but drank battery power and challenged any heatsink light enough to mount to a handlebar. Some people waste time with simulations first, before getting out there and seeing what a light is good for in real life. I didn't have a model in Zemax til my beam already converged nearly exactly as it does now. Modeling and simulation added another ~15% overall efficiency, mostly around the edges where the different reflected and refracted rays join up into a coherent transition instead of discrete blobs of light. The difference between a hobbyist's advanced prototype sufficient to prove a concept is physically practical and patentable, but still crude looking to the eye, versus a viable commercial product limited only by my ability to get this damn thing marketed better. |
#364
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Lezyne Deca Drive 1500XXL Report
Light weight is the raison here so layups are more fragile. The shuttle services manager for the Rio trip I did commented with humor on CF on the Rio while we talked about the Royalex hull I have .
.. I occasionally slam into bridge abutments. Uh yeah I doahn recall a heavy CF layup |
#365
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Lezyne Deca Drive 1500XXL Report
On 3/4/2017 10:55 PM, Barry Beams wrote:
snip The approach of grafting multiple round beams can construct a large light field, but consuming much more power, generating much more heat and glare, and needing a larger, heavier housing. My optics are unique, in that I create an even beam with less power consumption, glare, and wasted rays, in a smaller volume than other approaches. No one else is working on my basic premise of creating a variable focal line, instead of the traditional optical approach of having a focal point, that the optics are designed to. Read my patent if you want to try to get some concept of my intersecting, not necessarily concentric or parallel, light source and reflective cylinder approach. Take the word "cylinder" in its broadest mathematical definition here. I didn't start out trying to think about how to do it, only spent obsessive amounts of time bouncing light rays around in my mind trying to inductively figure out how to go backwards from the kind of beam I wanted to create, inductively to a weird optical layout that could create it. I would have rejected my approach as ridiculous, dumb, and no possible practical use, had I had a conventional education in optics. 10 years ago I was making multiple overlapping aimed round beams that made great light, for its time, but drank battery power and challenged any heatsink light enough to mount to a handlebar. Some people waste time with simulations first, before getting out there and seeing what a light is good for in real life. I didn't have a model in Zemax til my beam already converged nearly exactly as it does now. Modeling and simulation added another ~15% overall efficiency, mostly around the edges where the different reflected and refracted rays join up into a coherent transition instead of discrete blobs of light. The difference between a hobbyist's advanced prototype sufficient to prove a concept is physically practical and patentable, but still crude looking to the eye, versus a viable commercial product limited only by my ability to get this damn thing marketed better. Well personally I looked at the published beam patterns of several all-in-onelights. If the Raveman 1200 had been available, I would probably have purchased it. It has two LEDs and two separate lenses, and you can turn them on independently depending on the type of riding you're doing. This sort of arrangement was common in the days of incandescent lamps but largely disappeared with the advent of LEDs where the optics are more challenging. It also has an OLED display for charge level, and a USB output port. "The magic of this light is that it has two distinct lenses for each LED. One LED is very wide and flat, allowing the rider to see the periphery. This light also has a beam with a very distinct cut-off line horizontally, much like car headlamps and bike legal lights sold in Germany." It's almost like an StVZO legal light catering to those that are worried about what vehicles with extremely bright lights might think about a cyclist with a bright light, and a light that's usable for riding where you need some spill, and you can use both at the same time when you need peripheral illumination and more of a StVZO type beam which is deficient in peripheral illumination. http://oi64.tinypic.com/307x05i.jpg |
#366
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Lezyne Deca Drive 1500XXL Report
Like this ?
https://www.google.com/search?q=hell...obile&ie=UTF-8 Roof mount. Zo, mount a flat beam light on the fork n one blaster on bar one helmet light n urine No reason fooling with flat beam bar lights. The double beam one unit ala Chevy on a small package is square peg round hole. Market penetration n design problems A lot of the ascent to a rational ftee market plateau is marketing...if the market cannot see caws it's busy staying upright ... enter the Germans I |
#367
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Lezyne Deca Drive 1500XXL Report
On 3/2/2017 7:00 PM, James wrote:
On 03/03/17 10:58, Frank Krygowski wrote: One technical question for the electrical engineers: It's my understanding that low-end multimeters read AC assuming a true sine wave output. But I've encountered some dynamos have a different waveform. Back when I had easy access to an oscilloscope and a true RMS meter, I used that (expensive) true RMS meter to measure dynamo output. Do the EEs think a simple multimeter is good enough in this situation? I would replace the LED headlight with a 12 ohm resistor or 3W globe. Then you have very close to a sine wave and unity power factor. Back in the olden days, true rms meters and oscilloscopes were expensive. Now you can get a true rms meter for under $40 and a sufficient scope for low frequency (100Mhz) for under $30. Substituting a resistor or incandescent bulb for the LED headlight light may not tell you much that is useful. |
#368
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Lezyne Deca Drive 1500XXL Report
On 3/4/2017 7:13 PM, James wrote:
On 05/03/17 04:36, Frank Krygowski wrote: I'm astonished. What's the "period" on "periodically" whacking tree branches? How badly have you been hurt by these "whacks"? Where on the road are you riding when that happens? What do the SUV drivers and truck drivers do when they come to these tree branches? Do you know cyclists who have been injured by these tree branch whacks? Is there no agency that keeps the streets clear of such hazards? Why would people not demand that? While I was living in Brisbane, I used a section of road where there is a painted on bike lane and young planted trees that overhang the bike lane at times. They may have been trimmed, but a year ago I would move just outside the bike lane to avoid branches. /data=!3m6!1e1!3m4!1sM4L3bVhiqbK8iGQCb9-7xg!2e0!7i13312!8i6656!6m1!1e1 No injuries or other mishaps to report. While surely not every cyclist on every ride, a tree in the head is common enough, except in Frank's village. Much more for offroad cyclists but not unknown in small lanes and kiddy paths, ex-rail corridors, parks etc. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#369
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Lezyne Deca Drive 1500XXL Report
On 2017-03-04 17:02, sms wrote:
On 3/4/2017 2:27 PM, Joerg wrote: As long as they remain at a healthy temperature and the thermal protection is gradual instead of a simple cut-out. Point source isn't required if the lens is adequate. That is true. But lenses are often not adequate. A lot of people don't realize the importance of proper optics in lights. In terms of lenses the MagicShine clones had ... nothing. Zilch. Just a clear plastic plate in front. Of course, I did not ride one mile that way until the aftermarket lenses arrived. The lights would have been thoroughly blinding to others. Beats me why they sell them that way since a diffuser lens hardly cost much more than a clear one. -- Regards, Joerg http://www.analogconsultants.com/ |
#370
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Lezyne Deca Drive 1500XXL Report
On Sunday, March 5, 2017 at 11:53:03 AM UTC-5, Joerg wrote:
On 2017-03-04 17:02, sms wrote: On 3/4/2017 2:27 PM, Joerg wrote: As long as they remain at a healthy temperature and the thermal protection is gradual instead of a simple cut-out. Point source isn't required if the lens is adequate. That is true. But lenses are often not adequate. A lot of people don't realize the importance of proper optics in lights. In terms of lenses the MagicShine clones had ... nothing. Zilch. Just a clear plastic plate in front. Of course, I did not ride one mile that way until the aftermarket lenses arrived. The lights would have been thoroughly blinding to others. Beats me why they sell them that way since a diffuser lens hardly cost much more than a clear one. -- Regards, Joerg http://www.analogconsultants.com/ zoooooo what's the news on the trail vsiavee the deluge ? https://www.singletracks.com/bike-tr...ce-trails.html |
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