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-   -   two-fer (https://www.bikeforums.net/electronics-lighting-gadgets/1116453-two-fer.html)

keg61 07-27-17 09:46 PM

two-fer
 
Howdy folks, some of y'all have a pretty solid grasp on electrical stuff... I know next to nothing. is there a way I can power two Planet Bike blaze headlightshttps://smile.amazon.com/Planet-Bike...e+dynamo+light from one dynohub. I'm not opposed to using the hub for one and a sidewall drive(I don't race so I don't care about extra drag) for the other if necessary

unterhausen 07-27-17 09:56 PM

sure, just wire them up in parallel. I would suggest getting a better light though, the B&M IQ-X maybe

ItsJustMe 07-28-17 07:26 AM

It says it needs 2.4 watts. If your hub puts out double that, you should be good. Factor in taillight too if you are wiring that to the hub.

keg61 07-29-17 05:46 AM


Originally Posted by ItsJustMe (Post 19750835)
It says it needs 2.4 watts. If your hub puts out double that, you should be good. Factor in taillight too if you are wiring that to the hub.

it's a standard 6v/3w hub, I've never heard of one that puts out 4,8w that's why I asked, i'm pretty sure I read somewhere about LEDs requiring such low power that a single hub could power more than one headlight if not using a tail light, but I don't have the foggiest idea where I read it or if it even was a true statement. I have no problem using a battery tail light if it allows me extra light up front, some of the new tail lights seem to flash dam near forever on fresh batteries

noglider 07-30-17 10:06 AM

The lights may not provide full brightness until you're going fast, say 15 mph, but I know one person who did this, and he said it worked reasonably well. I don't remember which headlights he used.

But why do you want to do this?

wschruba 07-30-17 07:58 PM


Originally Posted by keg61 (Post 19750309)
Howdy folks, some of y'all have a pretty solid grasp on electrical stuff... I know next to nothing. is there a way I can power two Planet Bike blaze headlightshttps://smile.amazon.com/Planet-Bike...e+dynamo+light from one dynohub. I'm not opposed to using the hub for one and a sidewall drive(I don't race so I don't care about extra drag) for the other if necessary


Originally Posted by unterhausen (Post 19750333)
sure, just wire them up in parallel. I would suggest getting a better light though, the B&M IQ-X maybe

This really is the best suggestion...you can get a much more powerful light for what two of the blazes would cost, unless you want them, specifically, for some reason?

If you're on a budget, the Spanninga Kendo is probably the cheapest light you can get that is worth buying...but even that is not quite as nice as, say, a B&M Cyo Premium...

keg61 07-30-17 08:26 PM


Originally Posted by noglider (Post 19755351)
The lights may not provide full brightness until you're going fast, say 15 mph, but I know one person who did this, and he said it worked reasonably well. I don't remember which headlights he used.

But why do you want to do this?

my reason is that for 40 years I had jobs that required working at night, starting on the farm, thru the oil field, heavy equipment operator, and truck driver and i feel strongly that you can never have too much light. I see lots of claims about different lights but never have I seen evidence that any single light provides the field of view I want, they all have compromises. I'm thinking multiple lights aimed to create a flood of illumination would accomplish what I want. needing speed to get the lights going is no problem, I'm most concerned with lighting up a couple of specific hills that that will easily exceed 20mph. I understand the high dollar battery lights throw a long projection, I'm thinning a spot light aimed up the center with more of a flood effect to the sides... dammit! I forgot to mention, I like Planet Bike products, in general, is why I specifically asked about the blaze

noglider 07-30-17 09:30 PM

Sounds like a good reason to me. Let us know how it works.

fietsbob 08-03-17 03:44 PM

Consider a dynamo & a battery version as your combo,
both QR handle bar mounts. to take them off and pocket when you lock up your bike at work/school.
battery light will stay on when you slow down enough to have the dynamo one dim.
I think the dynamo one has a standlight capacitor to keep the light on a while at stoplights..




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