View Single Post
  #14  
Old December 4th 17, 05:28 AM posted to rec.bicycles.tech
Andre Jute[_2_]
external usenet poster
 
Posts: 10,422
Default New B&M 100lux headlight.

On Monday, December 4, 2017 at 1:21:44 AM UTC, Tim McNamara wrote:
On Sun, 3 Dec 2017 16:56:24 -0800, sms
wrote:
On 12/3/2017 4:28 PM, Oculus Lights wrote:
On Tuesday, November 21, 2017 at 2:34:34 PM UTC-8, James wrote:
https://www.bike24.com/p2144878.html

-- JS

Is there a power rating? 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. 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.


It's not all that new, and it's not very well rated. The complaints I
saw are a) the beam shape is too narrow, and b) the standlight is
inadequate. Neither is surprising. Dynamo lights make trade-offs, and
one major one is concentrating the limited available output into a
narrow beam, which is a big compromise in terms of safety, both in
seeing and being seen. The second is that the standlight is
necessarily fairly weak because the internal battery or super-cap
can't provide enough power.

The only suitable dynamo light for use in the U.S., in a dynamo-only
configuration, remains the Supernova E3 Triple 2. It has a proper
beam, and is not StVZO compliant for on-road use in countries where
StVZO compliance is mandatory.


Have you even looked at beam pictures?


Thing is, I am a longtime user of BUMM lamps, because they come on the sort of bikes I buy, and I've even lashed out my own discretionary money for a few in the aftermarket, and I agree with Scharfie that the throw of the BUMM lamps sacrifice close spread for impressive distance. You can search for the photographs I published over the years; some on my page at my publisher.. If you search in this forum and elsewhere, I've said so for years. I'll say it again. BUMM lamps trade off the cyclist's safety by giving him light too far ahead to matter (except to the idiots who want to pretend they're "fast" who are perfectly well served by Edelux lamps, which are basically BUMM lamps in lycra for cafe racers) and stinting on the light where it matters, closer in where he can ride into the ditch (in my lanes) or through the glass (near the gutter on many city streets). I've also said for years, to a chorus of abuse from the usual RBT morons, that the BUMM horizontal cutoff endangers the cyclist's life on the roads because -- to take an instance from my own roads -- the cutoff is lower than most important signs, like STOP or YIELD, so the cyclist rides blithely into traffic which has a prior right of way and therefore, especially if the driver is local and familiar with the roads, traveling at a fair clip and less attentively than if approaching a known unmarked intersection. A few years ago, riding at night, I shot through a YIELD sign that my BUMM first series CYO didn't show me, and damn nearly became a statistic under a truck which had the right of way.

Andre Jute
It helps to put your mind in gear before you open your mouth, especially if all you will spout is some old enmity, rather than sense.
Ads
 

Home - Home - Home - Home - Home