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#111
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SIX thousand and FIVE hundred lumens !!!!!!!!!!
On Sun, 7 Oct 2018 15:02:19 -0400, Frank Krygowski
wrote: On 10/6/2018 2:49 PM, Joerg wrote: On 2018-10-06 08:38, Frank Krygowski wrote: [...] Why on earth does someone riding a two lane highway with no intersections think they have to have a white light facing forward? It's a paranoia. Simple: 1. It prevents a large vehicle driver from overtake another large vehicle and then the driver seeing the cyclist when it's too late. I have other ways of preventing that horrible, tragic event. One of them is riding in the real world, not the fantasy "worst case scenario" world. It's not that I've _never_ had an oncoming motorist pull out to pass. It has happened perhaps two times in over 40 years of riding. And I've never had to leave the pavement to avoid tragedy. Hell, I've never even had to move onto the shoulder. 2. It causes oncoming motorists to see the cyclist much earlier and, for example, if a big semi comes they can pull a bit to the right so the semi can give the cyclist wide berth. I do NOT believe any practical light allows a motorist to see a cyclist _much_ earlier. In almost every case, I've seen on-road cyclists before I noticed that they had a light. And in no case did I see the light early enough to make any practical difference. You're fixating on a superstitious talisman, imagining benefits that don't exist in real life. I think I've mentioned seeing the bloke on a bike wearing bright orange knee socks nearly a kilometer away :-) I remember the orange socks but can't remember whether he had a light on his bike or not :-) -- Cheers John B. |
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#112
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SIX thousand and FIVE hundred lumens !!!!!!!!!!
On Sun, 7 Oct 2018 17:32:42 -0400, Frank Krygowski
wrote: On 10/6/2018 4:08 PM, Emanuel Berg wrote: Jeff Liebermann wrote: This doesn't work as well as it used to. Say that you are a kid today. Good luck getting your parents permission to destroy your TV. Even more good look is needed for you to put it back together. Or a modern mower. Or a modern phone. Or a modern whatever. Wrong. Repairing a car, TV, radio, mower, phone, etc., is much more difficult today than in 1975. Especially if you are to destroy/disassemble it first. My granddad had a professional repair shop, not like my cloak-and-dagger stuff. At this shop, they did absolutely *everything*. Bikes, cars, boats, radios, phones, TVs, you name it. Good luck finding such a shop today with a couple of guys being able to do all that with the usual set of everyday tools and a very small set of machines. The other problem, in America at least, is the high cost of skilled labor vs. the low cost of complete repair. Example: I've got a CD player in the kitchen that has gotten unreliable. It's unable to play some commercial CDs at all, and it has a hard time finding Track 1 on others. (For some reason, it will play OK if I tell it to jump to track 2.) And it has no hope playing most CDs I burn myself. I opened it, checked for sticky rails, cleaned lenses, etc. but found nothing. I took it to an electronics repair place, and the tech guy said "It will cost you $80 minimum for me to just look at it. You're better off buying a new one." It is not a new phenomena, nearly 50 years ago I took a half-horse electric motor to a repair shop and the guy there told me that I could buy a new motor cheaper "at Sears" then it would cost for him to repair it. -- Cheers John B. |
#113
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SIX thousand and FIVE hundred lumens !!!!!!!!!!
On Sunday, October 7, 2018 at 5:03:39 PM UTC-7, AMuzi wrote:
On 10/7/2018 6:43 PM, John B. Slocomb wrote: On Sun, 07 Oct 2018 07:54:07 -0700, Joerg wrote: On 2018-10-06 16:03, John B. Slocomb wrote: On Sat, 06 Oct 2018 07:40:47 -0700, Joerg wrote: On 2018-10-05 08:33, Radey Shouman wrote: Joerg writes: On 2018-10-04 18:13, Radey Shouman wrote: Joerg writes: On 2018-10-04 14:43, Radey Shouman wrote: Frank Krygowski writes: On 10/4/2018 2:12 PM, Joerg wrote: On 2018-10-04 10:40, Frank Krygowski wrote: On 10/4/2018 11:02 AM, Joerg wrote: On 2018-10-01 15:14, wrote: http://reviews.mtbr.com/magicshine-l...2018-interbike The beloved Magicshine brings us what we finally need in bike lights. Thanks to all the gods. 6500 lumens! I think you can have either 5000 or 1500 or all 6500 lumens. Thankfully now we will not only be able to blind everyone else on the road or trail, but we can now cause their eyeballs to burst into flames and maybe hopefully their heads will also explode. Yeah!!!!!! This one for their rear light is weird, quote "A sleep mode is triggered after one minute of inaction to save power, any vibration will immediately re-activate the unit". So the light will go out while waiting at an intersection? Really? Nobody raised their hand during the design review? Was there even a design review? First, their definition of "sleep mode" may not be "goes out.." It could, I suppose, just become much dimmer. In any case, it would be easy enough to jiggle the bike a bit to turn it back on. Not very smart on the part of the design engineers. But it's probably not necessary. Ohio law specifically permits lights that go out when the bike is stationary, ... Not a smart decision by the lawmakers. ... and there's never been a report of a death or serious injury caused by that feature. Grandpa drove without a seat belt all his life and never go hurt, so ... Grandpa also rode his bicycle without a six foot tall safety flag, a siren, a bell constantly and automatically ringing every time he moved, pads on his knees, pads on his elbows, body armor protecting his spine. Why are you not using all those measures? (Actually, maybe you are. With you, we never know.) BTW, it even happens from the front, even by police officers: https://fox2now.com/2018/07/30/polic...hone-in-video/ Nothing can replace bright light other than even brighter lights. Which both of my bikes have. Joerg, you're the master of the worldwide search for the vanishingly rare exception. That is NOT a common crash type, as any dispassionate search of the literature would shoe. And you have no evidence that your daytime headlight would have prevented it. Looks like the video has been taken down, at least fox2now.com can't find it. Works fine here. Works for me now, no more "video unavailable". ... The accident happened in broad daylight, no vehicles save the cop SUV and the cyclist visible for miles, cyclist waiting at an intersection, I think for a stop sign. Total f*up on the part of the cop, who was more or less apologetic. A daytime running light would not have helped. Not true. I clearly found that drivers notice me much better with bright lights. Even in the corner of their eyes is enough because it "distracts" them in a good way. All it takes is noticing a cyclist a second or two earlier and a collision can be avoided. Seriously? The cop would have looked up from his phone if only the cyclist had had a light? Sounds like magic. Easy to try. While distracted with some chore in your home, have someone walk towards you pointing a bright but not blinding LED flashlight. It works. A human eye is not insensitive in the directions where one does not look, just less sensitive. The "muffling effect" needs to be overcome and intense light is just about the only method to achieve that. This wasn't inside, it was outside in bright daylight, looked like hardly a cloud in the sky. Try this in daylight. It works. ... A really bright light is required to make much difference in that case. Bingo! Now you know why I have bright lights on my bikes. I experienced it again yesterday. I had to ride through city streets for many miles, partially at max speed. With the light fully on nobody cut into my path. Without lights that is different. Other clue: You are driving a car, looking ahead into traffic as you are supposed to do. The dashboard becomes largely unnoticed except for the occasional glance at the speedometer. However, when the yellow check engine light, the red oil pressure light, the overtemp light or the low fuel light comes on it is immediately noticed. Same if someone behind you flashes their headlights even while you aren't looking into the rear view mirror. That only happens if you have the habit, perhaps not completely conscious, of scanning the dashboard. How do you know it's "immediate"? You notice it when you notice it, and if it's 10 seconds after the event that's not a big problem, unlike the case for traffic on the road. If bright enough or if a less bright light in flashing mode I see that immediately. An airline pilot could even lose his license if he didn't. If bright enough... that is exactly what I said, isn't it. But a great many cars do not have bright warning lights. As for airline pilots... I can't speak for the airlines but USAF bombers have a very bright master warning light located at eye level on the instrument panel that comes on if any of the individual warring lights are illuminated. See https://en.wikipedia.org/wiki/Annunciator_panel "More complicated aircraft will feature "Master Warning" and "Master Caution" lights/switches. In the event of any red or yellow annunciator being activated, the yellow or red master light, usually located elsewhere in the pilot's line of sight, will illuminate. In most installations they will flash and an audible alert will accompany them. These "masters" will not stop flashing until they have been acknowledged, usually by pressing the light itself" You have exactly described what I mean. My front annunciator to car drivers is roughly in their line of sight and very bright. The rear one isn't so bright put pulsates. Not irritatingly but gently dimming up and down in random fashion like police cruiser lights. So even if drivers are distracted and glancing over to a GPS screen or cell phone they notice. Which is all I want. It works. A small price to pay for safety. I've got less than $50 worth of material in there and the total weight is around 1lbs due to a fairly large Li-Ion battery. That on is only large on the road bike, for 4-5h rides. "A small price to pay for safety"? You mean that after having spent only $50 you are now totally safe? The mountain lions and the milk cows can't harm you any more? I linked earlier to the guy wearing a safety jacket similar to Jay's: https://www.dailymail.co.uk/news/art...Liverpool.html The shooter got away SAFELY on his bicycle, due at least in part to his magic garment. Hi-Viz saves lives, even if sometimes the lives of murderers. Magic, in its literary form anyway, tends to create plot turns like that. Pah-lease! No homicidal riff-raff was wearing my super-fine, hi-viz, four-way stretch water resistant, race fit Castelli Gabba jacket -- with zippered vents and reflective details. He was probably wearing some dreadfully baggy Sportful rag from Wiggle. Now that's criminal! I didn't see anything in the article about whether he was wearing a helmet. Was he crazy? I think they'll start catching more of these people as criminals get into GPS-based cyclo-computers. The rider pops off a few shots, gets on his bike, fusses with his Garmin waiting for the satellite up-link, checks to make sure he is on Strava, sees whether he is beating his virtual self, etc., etc. The police arrive. -- Jay Beattie. |
#114
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SIX thousand and FIVE hundred lumens !!!!!!!!!!
On Sun, 07 Oct 2018 09:46:19 -0700, Jeff Liebermann wrote:
Within the general area where I live, we have repair "shops" for string instruments, music keyboards, computahs, machine tools, bicycles, mechanical clocks, etc. Over here, you can not source the bicycle parts from a wholesaler without a shop front. |
#115
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SIX thousand and FIVE hundred lumens !!!!!!!!!!
On Mon, 08 Oct 2018 06:59:47 +0700, John B. Slocomb wrote:
A few years ago the CHP did a study of bike-auto collisions in Los Angeles County and found that more then half the accidents were the fault of the cyclist and I recently read a DOT study that showed that 20% of the cyclists that died in an accident had been drinking alcohol it would seem that bicycle safety is largely a matter of the cyclist his(her)'s own actions rather than the brightness of his(her)'s driving lights. What about the other 80%. Were they punished by execution because they didn't drink alcohol? Anyway,in my observationn, a lot of bicyclist over here only rode bicycles when they could fit an ICE as a replacement for the car they were no longer allowed to drive, having lost their licence for DUI. Thankfully ICE power assist is now banned. So riding is quieter. |
#116
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SIX thousand and FIVE hundred lumens !!!!!!!!!!
On Sun, 07 Oct 2018 19:03:38 -0500, AMuzi wrote:
On 10/7/2018 6:43 PM, John B. Slocomb wrote: You mean that after having spent only $50 you are now totally safe? The mountain lions and the milk cows can't harm you any more? I linked earlier to the guy wearing a safety jacket similar to Jay's: https://www.dailymail.co.uk/news/art...earing-hi-viz- jacket-shoots-27-year-old-streets-Liverpool.html The shooter got away SAFELY on his bicycle, due at least in part to his magic garment. Hi-Viz saves lives, even if sometimes the lives of murderers. Magic, in its literary form anyway, tends to create plot turns like that. and look at the other form of "safety" to shooter gained; absolutely no other description of shooter or escape vehicle. all witnesses appear to have been blnded by that safety jacket. Whip around the corner, remove the jacket and you're an entirely different person. |
#117
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SIX thousand and FIVE hundred lumens !!!!!!!!!!
On Sun, 07 Oct 2018 17:36:34 -0700, jbeattie wrote:
I think they'll start catching more of these people as criminals get into GPS-based cyclo-computers. The rider pops off a few shots, gets on his bike, fusses with his Garmin waiting for the satellite up-link, checks to make sure he is on Strava, sees whether he is beating his virtual self, etc., etc. The police arrive. Fit bits are already doing that. In this case it was the victims. https://arstechnica.com/science/2018...s-fitbit-data- tracked-her-dramatic-death-and-maybe-her-killer/ Peeps might be able to train t beat polygraphs, but will they be able to cover up their fitbit. |
#118
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SIX thousand and FIVE hundred lumens !!!!!!!!!!
On Sun, 07 Oct 2018 13:43:38 -0500, AMuzi wrote:
+1 for documentation and youtube which make this all much less black art than it once was. At one time, an auto repair for girlfriend/neighbor (that is, for an unfamiliar vehicle) started with a tour of used bookstores for a manual. In 2018, my employee was outside bitching and moaning that a dead part on his Toyota was unreachable while I found a youtube video, walked outside and pulled the 'hidden' release panel. Nicely done. I've had similar experiences trying to open laptops, smartphones, appliances, and gizmos where the sadistic manufacturer elected to make disassembly as difficult as possible. Extra credit to Motorola for left handed screw threads on their original DynaTac phones. YouTube wasn't around when I stripped the threads in the plastic case. However, ever since YouTube and iFixit arrived, such damage has been minimal. Before diving into an unknown device, I watch the teardown on YouTube which usually explains all the necessary tricks and contortions needed to take it apart. Unfortunately, YouTube is also polluted with some really bad ideas, which can be identified by reading the comments. Unfortunately, a side effect of all this YouTube viewing is that I've turned into a YouTube addict. I don't have cable or satellite TV. I don't rent DVD's. The local OTA (over the air) TV stations are all in Spanish. So, I watch YouTube and a little Netflix on a Roku 3 box. The Roku is necessary because YouTube might play 10 commercials per hour if I watch on my computah, but only 2 per hour if I watch on the Roku box. No clue why they do that. I should watch some cooking videos. I was forced to eat my own cooking tonite and now I feel awful... -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#119
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SIX thousand and FIVE hundred lumens !!!!!!!!!!
On 10/1/2018 6:29 PM, Jeff Liebermann wrote:
snip Let's see what the package can do as a heat sink. Latent heat for aluminum is 0.900 Joules/gm-K. The light weighs 142 grams, which I'll assume is mostly aluminum. The light dissipates 71 watts with all the LED's turned on. I would guess that 75C would be uncomfortably warm for both the electronics and the bicycle rider. That's a temp rise of 50C (50K). Joules = Watts * seconds = 71 watts * seconds. Therefo 0.900 = 71 * seconds / (142 * 50) Time(sec) = 900 seconds = 15 min Not too horrible. One has 15 minutes of full brightness lighting, in still air, before the LED's burn your hand or cause a thermal shutdown. They even admit that full power requires sufficient airflow requiring moderate speed to prevent throttling. A long time ago, one poster here was insisting that one reason LED lights were so wonderful was the lack of a "white-hot filament." What he failed to understand was that a high wattage LED has a very hot semiconductor junction and that extracting the heat from that junction is a very difficult process, more difficult than cooling an incandescent or HID lamp. Some LED lights for cars even have fans as part of the thermal solution. Still waiting for liquid cooled bicycle lights. I was over at the Computer History Museum last week where they have several liquid coold computers on display. |
#120
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SIX thousand and FIVE hundred lumens !!!!!!!!!!
On Sun, 7 Oct 2018 17:27:35 -0400, Frank Krygowski
wrote: On 10/6/2018 3:44 PM, Jeff Liebermann wrote: I like to photograph what I tear apart and reverse engineer. For example, in the bicycle section: Cygolite Streak 280 headlight: http://www.learnbydestroying.com/jeffl/pics/bicycles/Cygolite%20Streak%20280/index.html K1009 headlight: http://www.learnbydestroying.com/jeffl/pics/bicycles/K1009%20light/index.html Since I'm a mechanical guy, not an electronics guy: Both of those seem to show far more electronics bits than I'd have thought necessary. Any chance of getting you to explain what they do? Sure, but I'll need to trace out the schematic in order to give a sane explanation. That will take about an hour to do (including drawing a readable schematic and maybe some oscilloscope waveforms). Some of the chips are not labeled, but I have a good idea what they might be. I'll do it if you really want it done, but it will need to wait a week or two when I hopefully will have the time. I had an off-brand LED dynamo light fail on me. The LED fried itself. Not exactly. It probably overheated because the thermal connection between the back of the LED and the COB (chip on board) aluminum heat sink was probable poorly connected. I've had it happen to me. I tried to glue another tiny LED to the COB, but it didn't last. So, I bought a replacement COB, filed few extra notches to make it fit, and it's working today. In the course of replacing it (which was difficult because of the lack of wowrking space) I was able to take some guesses at the function of the circuitry components - rectifying, regulating, etc. But there were only about six or eight electronic devices in there. I'm surprised a DC battery lamp needs much at all. Well, the basics electronic components a 1. One or more LED's on a COB or "star" heat sink. 2. A constant current driver IC that delivers about 350ma to each LED. This is typically an AMC7135 chip and easily recognized because of its SOT-89 package: https://www.google.com/search?q=7135+LED+driver&tbm=isch https://www.electroschematics.com/wp-content/uploads/2016/04/acm7135-datasheet.pdf If you need more than 350ma, just add more 7135 chips in parallel such as this abomination with 4 chips: http://lygte-info.dk/pic/DriverTest/IO/Qlite%20Rev.A%207135x8%20Multiple%20Modes/DSC_3691a.jpg 3. A PWM (pulse width modulation) light dimmer and controller. That's the 8 pin chip in the above JPG. If you want half the average light output, just modulate the DC power to the LED with a 50% duty cycle. 0% is power off. 100% is maximum output. Some have an automatic power off timer. The chips is a low end Arduino MPU. That's the basics. Some optional extras a 1. Battery charging circuitry. 2. BMS (battery management system) to prevent running the batter down to below about 2.7VDC, which tends to kill the battery, above 4.2VDC, which tends to kill the battery, charging at too much current, which tends to kill the battery, or inserting the battery backwards, which tends to kill everything. 3. Stand light circuit. Basically a super capacitor and a switching transitor or MOSFET. When the dynamo isn't producing power, the super capacitor takes over. 4. Battery charge indicator. 5. Warranty timer that blow up something just after the warranty expires. Questions? -- 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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