Recent content by swhs

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    Lupine Rotlicht LED Rear Light - 160 vs 40 Lm

    The original document linked to is bike24's sale page which does not list the question "But wouldn't lowering the headlamp limit improve being able to see taillamps? And can it technically be done?" in neither the overview nor fact sheet, at least not for me. Do you get to see a different page...
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    Lupine Rotlicht LED Rear Light - 160 vs 40 Lm

    Just as Marcturus, I wonder where this statement came from... Car headlamps approved via ECE rules (r113) are restricted in lux and lumen, and of course the light going upwards (above the horizon) is limited just as much as with incandescent lights so that has not increased from before Xenon...
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    Custom Lens Designer Required (StVZO, Cree XP-L)

    Not just the lens, the entire lamp, but also manual undergoes certification. There are requirements for the manual, housing, mount, wiring if cables are external, resistance of the lens to certain chemicals, status display for battery powered lamps, and of course the beam pattern. Edit: As you...
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    Lupine Rotlicht LED Rear Light - 160 vs 40 Lm

    Hello again to CPF, after a long absence... The proper way to look at any light that is directly to be seen, is using the light density in cd/m^2 but you also need a certain luminous flux (lumen, for the non-experts this is sort of the 'amount of light', though light is a flow so therefore...
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    REVIEW: CB SEEN City Slicker Twin LED 500 Lumen, Rear Bike Light

    Datasheet: Vf is around 2.7V for these LEDs at around 0.1A - 0.35A, and the 67 lm at 0.35 A means in this lamp you get about 67 * 0.6 * 0.85 = 35 lm... + a bit extra as the LEDs are driven even lower than 0.35A, but not much.
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    REVIEW: CB SEEN City Slicker Twin LED 500 Lumen, Rear Bike Light

    Well, as there are of various LEDs themselves fairly accurate measurements (not by the manufacturer! For Cree esp. the values measured have deviated a lot! In a bad way, so less output than claimed), the easiest method is simply this: Take the measured values for bare LEDs, if needed do some...
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    REVIEW: C&B SEEN City Slicker Twin XM-L L2 1250 Lumen, Wireless Front Bike Light

    Re: REVIEW: C&B SEEN City Slicker Twin XM-L L2 1250 Lumen, Wireless Front Bike Light So is the drop-off in lightoutput from the heat of the lamp (LED regulated lower to prevent overheating) or because the electronics doesn't keep power to the LEDs constant when the battery pack gets drained?
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    REVIEW: CB SEEN City Slicker Twin LED 500 Lumen, Rear Bike Light

    Looks high quality, but I'm wondering how annoying it is to ride behind (as a cyclist)... (because of the lens instead of a light distributing optic) The lamp bounce effect can be seen in action from headlamps too as I noted on my site (...
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    Busch und Muller IQ Cyo Premium

    [Rule 4 violation by swhs deleted] I don't review the Cyo premium because I tested the Edelux so there's no point. Understand now, [Rule 4 violation by swhs deleted] And if you don't see the artefacts when it's dark [Rule 4 violation by swhs deleted] *** swhs, namecalling and personal...
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    caught in thick fog......

    So, I was thinking about it a bit more, and perhaps the people who do notice a difference between cutoff and non-cutoff, have less sensitive vision? (and it gets under a certain contrast limit for them?) Like some people claim they can only see 35m with the LBL on high, whereas I see 70m with...
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    caught in thick fog......

    I tested with cutoff beams and circular beams for what I could see (ahead and on the ground), and the cutoff will mean a little less 'noise' but it was insignificant and as I said, the entire beam mostly lights up the fog because of the scattering, this is the whole reason why it doesn't make...
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    caught in thick fog......

    I tested it. And it didn't make any difference for on the bike at least (angles are slightly bigger than in cars) but as I looked at fairly small angles similar to a car (with my flashlight tests), I think it will not matter there much either. I tested that because some people claim that in fog...
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    caught in thick fog......

    Smoke itself might not be good enough, depending on particle size, but you can simulate fog with smoke. I have done but it was not on purpose :) For example I had some toast burnt so bad that the whole lower floor of my house was full of smoke. The smoke itself after a while was no longer...
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    caught in thick fog......

    I tested all these things years ago: http://swhs.home.xs4all.nl/fiets/tests/verlichting/experimenten/index_en.html Results: Warm white is best, neutral is almost the same as cool white, but the difference of cool/neutral with warm white is not great. Throw is also not really an issue, in that...
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    "Flashlight Etiquette" for Cyclists

    There is no good physical reason to use cool white LEDs at all. Therefore the only possibility is that using them is caused by marketeers and I presume by people wanting them as they 'appear to be brighter'. And thus you get a loop until someone decides to break out and tell people the facts...
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