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Old December 11th 17, 02:19 AM posted to rec.bicycles.tech
James[_8_]
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Posts: 6,153
Default New B&M 100lux headlight.

On 08/12/17 19:52, Oculus Lights wrote:
On Tuesday, December 5, 2017 at 9:35:43 PM UTC-8, James wrote:
On 04/12/17 11:28, Oculus Lights wrote:
On Tuesday, November 21, 2017 at 2:34:34 PM UTC-8, James wrote:
https://www.bike24.com/p2144878.html



Is there a power rating?


One can safely assume it will work with any normal 6V/3W dynamo.

100 lux at 10 meters, as the STVZO test requires, is exceedingly
bright. I'm hesitant to state they "must" be drawing at least
so much power, but my gut feeling is that its in a range that a
single LED can't handle.


Depends on how the light is focused.

Anyone can rate a light without stating the distance. My single
LED 325 lumen measures 33 lux at 10, 500+ lumen measures 50 lux,
and the best of the others on the market, such as Supernova's 205
lm that's standard equipment on many e-bikes, measure 25 lux at
10 meters, at most.


My B&M IQTec Premium is rated at 80lux. It also works with a 6V/3W
dynamo.

The light is focused to a very bright band just before the cut off,
so that you can aim the light well in to the distance and achieve
a relatively even illumination of the road surface over the entire
distance.

If yours is only reaching 33 lux, it is less well focused and more
of a flood light.

See images here.
http://www.bentrideronline.com/messa...d.php?t=131473



Those "if" statements followed by unsure speculation from
conventional wisdom are always fascinating.


There was nothing unsure or speculative about my reply.

--
JS
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