OK - here's some 'any advice'...
I have the corresponding Philips Saferide ebike light. It's made for direct connection to the bike's battery system/circuit (with some upper and lower voltage limits and observing appropriate polarity of course). Given the highly regulated European ebike market I would expect the Busch & Muller to work in exactly the same way.
As I expected, a little digging turns up the following (
emphasis is mine):
from
http://extraenergy.org/main.php?language=en&id=36860...
IQ Technology by Busch & Müller Busch & Müller offers a large range of LED headlights that are suitable for direct connection to e-bike batteries, some of those carrying the mark approval "e" for vehicles with number plates... At the special exhibition LEV components at ISPO BIKE, Busch & Müller will show the LED headlight LUMOTEC IQ Cyo T.
IQ technology: light output of 70 Lux. With daytime running light LICHT24 - for better seeing and being seen. Sensor-controlled day and night mode. Mark of approval "e" for speed e-bikes.
For DC voltages from 6 to 75 V. Connection for regular 6 V dynamo-powered rear light.
from
http://www.bumm.de/produkte/lumotec-iq-cyo.html...
Google Translation:
“
LUMOTEC IQ Cyo for E-Bikes
Our headlights for connection to e-bike batteries are not regularly available in stores - your bike dealer can get these special variants but for you. Let us advise you there, which model is best suited for your e-bike. A selection of available versions can be found here.
LUMOTEC IQ Cyo T
Item 175Q75/6TSNE-07
*
Input voltage: 6.5 to 75 V DC
* IQ Lighting: 70 Lux
* Daytime running lights LIGHT24
* Bright / dark sensor
* ON / OFF switch
* Taillight connector
* Certification for fast e-bikes
* Retail packaging / instructions
Item 175Q42/6TS04991
* Input voltage: 6-42 V DC
* IQ Lighting: 70 Lux
* Daytime running lights LIGHT24
* Bright / dark sensor
* Without a switch (Operation only on-board system)
* Taillight connector
* Suitable for Bosch systems Performance and Active Line”
Note that at the above address there may be further instructions in German - no time to dig further I'm afraid.
Savvas