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

--
JS

Those "if" statements followed by unsure speculation from conventional wisdom are always fascinating.
Less well focused and a flood light?
The beam really is different than other types, its its own. Not a flood, not a spot.
The more lumens with the least lux measured brightest spot, the more even a beam must be.
Eventually lights will be measured and rated with beam lumens. That measurement throws away lumens above and below threshold percentage. This gives a nice measure of usable visibility. But cold day in hell when the companies that wrote their own spec will agree to it because of how many of their total lumens are wasted with excessively bright spots, and lost with unreasonably dim edges that the peripheral vision filters out because of how the eye needs stop down the center bright spot.
Check out my ray trace of the Oculus three LED retail light, shown on the "learn more" page of the Oculus Lights website. There's no bright spot, not even a visible cluster of red anywhere.

My STVZO design with one LED, fills out wider than the others across the brighter upper band just below the horizon, and still fills in evenly below it nearly down to road level, with at least 75% of the bright spot's lux measure.