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#381
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Lezyne Deca Drive 1500XXL Report
On Sun, 05 Mar 2017 10:50:56 -0800, Jeff Liebermann
wrote: http://reviews.mtbr.com/2016-bike-lights-shootout-lumen-measurements Incidentally, methinks that is a Pro-Lite PLMS-2000 intergrating sphere in the photo: http://www.pro-lite.co.uk/File/PLMS_medium_sphere_photometers.php My guess(tm) is about $3,000 used. I want one. More bicycle lighting tests and beam patterns: https://www.bikelightdatabase.com -- 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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#382
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Lezyne Deca Drive 1500XXL Report
On Sunday, March 5, 2017 at 10:50:55 AM UTC-8, Jeff Liebermann wrote:
On Thu, 2 Mar 2017 22:53:35 -0800 (PST), Barry Beams wrote: Just a note about the L&M Urban's output being referenced. They keep ~rated output for the first 30 seconds, then drop off sharply as the unit heats way up. Most small single LED big bright spot beam type lights dim with time similarly. That's the standard procedure. When MTBR tested lights last year: http://reviews.mtbr.com/2016-bike-lights-shootout-lumen-measurements "We use the FL-1 standard and measure the Lumen output at the 30 second mark after turning the light on." etc. The output of the Lezyne does not go down after 30 seconds. I ran it in my office to drain the battery and it stayed at full brightness with no air-flow. It did get very warm but it has a very good thermal solution in what looks like a die-cast aluminum enclosure with fins. The older, single LED lights probably had to monitor temperature and reduce power, but even the thermally conductive plastic, multiple LED lamps, don't have to do that, at least not the ones I've seen. |
#383
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Lezyne Deca Drive 1500XXL Report
AE6KS
https://www.google.com/#q=audi+2017+...dlight+video&* illuminate the berm side knowing where the other side is if an oncoming vehicle is there plus large factors of vehicle fore aft position relative to oncoming road surface...and oncoming vehicle lights. the antique headlight laws area is largely for the benefits of antique headlight manufacturers tho Citro's reliability standards are prob suspect visavee American testing procedures in American climactic conditions and and lack of owner-mechanic attention relative to Yurp standards .... an example is the deer light condition where the road rolls thru forest at 2AM, no approaching vehicles and grazing /commuting deer. The Audi would adjust higher and upward in elevation prob receiving feedback in reflection. remember the GM 4 was designed in 3 BC |
#384
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Lezyne Deca Drive 1500XXL Report
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#385
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Lezyne Deca Drive 1500XXL Report
On Sunday, March 5, 2017 at 11:33:49 AM UTC-8, SMS wrote:
On Sunday, March 5, 2017 at 10:50:55 AM UTC-8, Jeff Liebermann wrote: On Thu, 2 Mar 2017 22:53:35 -0800 (PST), Barry Beams wrote: Just a note about the L&M Urban's output being referenced. They keep ~rated output for the first 30 seconds, then drop off sharply as the unit heats way up. Most small single LED big bright spot beam type lights dim with time similarly. That's the standard procedure. When MTBR tested lights last year: http://reviews.mtbr.com/2016-bike-lights-shootout-lumen-measurements "We use the FL-1 standard and measure the Lumen output at the 30 second mark after turning the light on." etc. The output of the Lezyne does not go down after 30 seconds. I ran it in my office to drain the battery and it stayed at full brightness with no air-flow. It did get very warm but it has a very good thermal solution in what looks like a die-cast aluminum enclosure with fins. The older, single LED lights probably had to monitor temperature and reduce power, but even the thermally conductive plastic, multiple LED lamps, don't have to do that, at least not the ones I've seen. You would be hard pressed to tell a 10% drop in brightness. So your test means little. However, properly designed LED lighting doesn't heat up and so the brightness doesn't change as it "heats up". And rechargeable batteries don't loss much output until they are nearing exhaustion. |
#386
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Lezyne Deca Drive 1500XXL Report
On Sun, 5 Mar 2017 10:55:08 -0800 (PST), Frank Krygowski
wrote: On Sunday, March 5, 2017 at 11:10:47 AM UTC-5, AMuzi wrote: 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. I don't doubt the "not unknown" in those special circumstances. But "not unknown" is another way of saying "it's happened at least once." Perhaps on kiddy paths. Perhaps on badly maintained rail trails. I don't think it's possible to specify a lower bar for "Danger! Danger!" Let's remember that the original point (by Scharf) is that a road-riding cyclist is in danger if he uses a modern StVZO headlamp because he can't see tree branches low enough to "whack" him in the head. So far, nobody has produced a single incident describing such an injury. And I've been extremely interested in bike injury data for probably 20+ years now. I've never encountered an account of such an injury. I've heard of people seriously injured by getting their front wheel in an Amish buggy rut; or by having their studded tire lose traction on an ice dam at the end of their driveway, after a successful ride home in snow and ice; or by sliding into a crash due to slimy mud that washed across an MUP; or by running into a pedestrian who suddenly turned in front of them; or by other weird mechanisms. But I've never heard of a road cyclist (or actually, even an off- road cyclist) injured by running his head into a tree branch. If we can have just a few specific examples, this "hazard" might be believable. But where are those examples? - Frank Krygowski Actually I did get knocked off my bile by a low hanging branch and broke my pelvis. However it was not quite what the California Boys are talking about as it was perfectly visible, it was bright and sunny, about 10:00 in the morning, and I elected to duck under the branch but, obviously, didn't duck quite low enough. And, finally, as it was an ultra light weight aluminum bike with a carbon fork, 19mm tires, and no lights. I wonder, had I had lights would I have been uninjured? Or maybe that carbon fork? -- Cheers, John B. |
#387
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Lezyne Deca Drive 1500XXL Report
On Sunday, March 5, 2017 at 1:56:07 AM UTC-5, Barry Beams wrote:
Snipped Just curious. Do you give a money back guarantee if your light does NOT meet the customers needs? If I buy a CygloLite from Mountain Equipment Co-op and the light does not work as I need or expected I can return that light for a full no questions asked total refund. Cheers |
#388
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Lezyne Deca Drive 1500XXL Report
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#389
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Lezyne Deca Drive 1500XXL Report
On 3/5/2017 7:55 PM, John B. wrote:
On Sun, 5 Mar 2017 10:55:08 -0800 (PST), Frank Krygowski wrote: On Sunday, March 5, 2017 at 11:10:47 AM UTC-5, AMuzi wrote: 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. I don't doubt the "not unknown" in those special circumstances. But "not unknown" is another way of saying "it's happened at least once." Perhaps on kiddy paths. Perhaps on badly maintained rail trails. I don't think it's possible to specify a lower bar for "Danger! Danger!" Let's remember that the original point (by Scharf) is that a road-riding cyclist is in danger if he uses a modern StVZO headlamp because he can't see tree branches low enough to "whack" him in the head. So far, nobody has produced a single incident describing such an injury. And I've been extremely interested in bike injury data for probably 20+ years now. I've never encountered an account of such an injury. I've heard of people seriously injured by getting their front wheel in an Amish buggy rut; or by having their studded tire lose traction on an ice dam at the end of their driveway, after a successful ride home in snow and ice; or by sliding into a crash due to slimy mud that washed across an MUP; or by running into a pedestrian who suddenly turned in front of them; or by other weird mechanisms. But I've never heard of a road cyclist (or actually, even an off- road cyclist) injured by running his head into a tree branch. If we can have just a few specific examples, this "hazard" might be believable. But where are those examples? - Frank Krygowski Actually I did get knocked off my bile by a low hanging branch and broke my pelvis. However it was not quite what the California Boys are talking about as it was perfectly visible, it was bright and sunny, about 10:00 in the morning, and I elected to duck under the branch but, obviously, didn't duck quite low enough. I'm interested in the details. Care to describe the situation more thoroughly? -- - Frank Krygowski |
#390
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Lezyne Deca Drive 1500XXL Report
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