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#101
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The University of Aalborg Study on Daytime Flashing Lights forBicycles.
On Mon, 20 Mar 2017, Jeff Liebermann wrote:
If you arrange with Reelight to send Please have them ship the bribe, errr... evaluation sample, to the address below. Did it work? Received any lights yet? Maybe from more corrupt, non-Danish companies? ;-) |
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#102
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The University of Aalborg Study on Daytime Flashing Lights for Bicycles.
On Sun, 9 Apr 2017 14:15:04 +0200, Sepp Ruf
wrote: On Mon, 20 Mar 2017, Jeff Liebermann wrote: If you arrange with Reelight to send Please have them ship the bribe, errr... evaluation sample, to the address below. Did it work? Received any lights yet? Maybe from more corrupt, non-Danish companies? ;-) Yes and thank you for the StVZO K-1009 light. It miraculously arrived in one piece on Friday. I installed four NiMh batteries and it works as expected. I'll be going some measurements and ride testing after next weekend. The connector on the bottom seems to be for DIN 33958 6v 3w dynamo power. I have a cheap bottle dynamo somewhere and will give that a try. Measuring the lumens output with my lux meter method will be a problem due to odd spot pattern. I'll use graph paper and just count squares. https://internetkaufhaus24.de/Produkte/frontscheinwerfer-led-30-lux/6168332 https://www.amazon.de/Frontscheinwerfer-LED-LUX-FRONTSCHEINWERFER-40208/dp/B01J9NWJHU I also bought a used Gygolite Streak 280 with a rather old battery. The replacement battery and missing mount should arrive shortly, which I'll add to my testing. http://cygolite.com/product/streak-280-usb/ http://802.11junk.com/jeffl/pics/bicycles/Cygolite%20Streak%20280/ Thanks again. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#103
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The University of Aalborg Study on Daytime Flashing Lights forBicycles.
Jeff Liebermann wrote:
On Sun, 9 Apr 2017 14:15:04 +0200, Sepp Ruf wrote: On Mon, 20 Mar 2017, Jeff Liebermann wrote: If you arrange with Reelight to send Please have them ship the bribe, errr... evaluation sample, to the address below. Did it work? Received any lights yet? Maybe from more corrupt, non-Danish companies? ;-) Yes and thank you for the StVZO K-1009 light. It miraculously arrived in one piece on Friday. I installed four NiMh batteries and it works as expected. I'll be going some measurements and ride testing after next weekend. The connector on the bottom seems to be for DIN 33958 6v 3w dynamo power. Would be nice. For a dirt-cheap lamp, an oddly luxurious undocumented feature? On roughly similar lamps, I've seen a "4AA cooker" charger connection there. DIN 33958 includes dynamo powered as well as purely battery powered lighting equipment. I have a cheap bottle dynamo somewhere and will give that a try. Measuring the lumens output with my lux meter method will be a problem due to odd spot pattern. This no-frills StVZO spot, while not representing the bare legal minimum which would resemble an I-beam profile, was probably designed quite pragmatically right along the TA-23 / DIN-33958 measurement grid: http://www.fa-technik.adfc.de/Komponenten/Scheinwerfer/ta23zonen.gif I'll use graph paper and just count squares. Sounds like work. https://internetkaufhaus24.de/Produkte/frontscheinwerfer-led-30-lux/6168332 https://www.amazon.de/Frontscheinwerfer-LED-LUX-FRONTSCHEINWERFER-40208/dp/B01J9NWJHU These seem to be somewhat weaker, older versions. K numbers don't really identify specific lamp builds: Once issued, one and the same number might be reused by the manufacturer with new lamps - even if lab tests need to be performed and paid anew. I also bought a used Gygolite Streak 280 with a rather old battery. The replacement battery and missing mount should arrive shortly, which I'll add to my testing. http://cygolite.com/product/streak-280-usb/ http://802.11junk.com/jeffl/pics/bicycles/Cygolite%20Streak%20280/ Likely to look brighter on high and more even on medium than the K-1109. As always, doesn't look as if it could do beam evenness and low-glare reach at the same time. |
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