Bike lamp for Video? This one is different

Postmaster

Postmaster

Dark Side of the Camera
Bike lamp for Video?

Yeah I know how that sounds.
But check it out - this one is different.

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luminosity more than 140 lux
Special CAD reflector
Up to 5 hours lighting via a Lithium Ion accumulator included in the scope of supply
With electronically controlled charging and protection against total discharge
Integral LED capacity indicator
Rotatable and detachable headlamp
Completely water proof
Assembly on and under the handlebars

Sounds great in my book, thou the price(729 Euros) is a bit steep - to say the least.

http://www.bumm.de/index-e.html Click on "Innovations" and then "Big Bang"

But they also have an other (less powerful) one that still would make a great headlight for 65 Euros.

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Energy-saving high-performance LED of up to 100,000 service hours
Brillant white light with Xenon effect
State-of-the-art electronic system with 90% efficiency
with integrated cooling-system
Capacity and battery charge indicator
Takes only 4-5 hours to full charge
2-position switch:
High-Power-Mode: 40 lux (5 hours)
City-Eco-Mode: 10 lux (20 hours)
Safe operation:
1) Eliminates overcharging
2) Identifies batteries to exclude unintentional charging
Handlebar adapter with quick-locking mechanism, rotatable and traversable, headlamp can be pulled off
optional: 4 Ni-MH batteries, without memory effect, with enhanced capacity (2,100 mAh)
optional: Controlled charger enclosed

http://www.bumm.de/index-e.html Click on "Innovations" and then "IXON IQ"

Frank
 
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Brightness ???

Brightness ???

Hmm ! 40 lux , 140 lux .. that does not seem like much luminosity unless you wish to video something less that 3 feet away. I really don't know how they measure the intensity in Europe but here in US I beleive it is measured at 3 feet away in lumens and to convert it to FC (foot candels) is to X the lumens by approx .092, perhaps they have meant FC in which case would make more sense. Even rated at FC it is still not a bright enough light for good video capture, especially if you have to diffuse it for more spread. Also anything less than 60 degree dispersion is really not suitable to video with at the wide angle end of a video zoom out. Vignetting. Let alone the color temperature. Almost 800 euros for that ???
 
Lumen is a measure of light output. It is used to compare bulbs.

Lux and fc are measures of light intensity, and useful for comparing fixtures.

1 fc = 10.77 Lux. 140 Lux is 13 fc.

That is a meaningless number unless you know at what distance you get this luminous intensity (and also at what angle / circle of light).


For comparison, my on camera light, a customized Lowel Pro, gives 65 fc ( 700 lux) at 6ft. That translate to 140 lux at 12-15 ft. So that EUR 650 lamp might be just as good, or it might be completely worthless, depending on the distance.

Then there is the color temperature, and also the CRI, which is probably not very good for these lamps.

PS. I doubt a German manufacturer would use fc to measure its fixtures. Not going to happen before you start loading on sauerkraut.
 
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That's right, without distance the measurement is worthless. They really should post what they mean there.

Just trying to guess though, in their product web page they show some examples with the beam going out to 25 meters. Perhaps they are implying it is 140 lux at 25 meters. That would be pretty good actually if its what they meant. That's almost 80 feet...

By the way, there is no easy equation to go from lux to lumens.

As far as someone using FC or lux, they use lux mostly in Europe and we use FC in the west. I personally like lux so I often measure or report things in lux when using a light meter.

Like the previous poster showed, there is an easy formula to translate between lux and FC.
 
Actually I bought a flashlight.
Fenix TA21 Premium Q5

It outputs up to 225 Lumen or FC.

It´s more than enough for what I need and was only 80 bucks.

Frank
 
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