New Light runs direct from battery.

[Deleted member 4366]

This came up on ES today. Not asbright as the three T6 XM-L one, but should still be pretty good. Main advantage is that it runs directly from main battery voltage: 24v, 36v, 44v, 48v. About £15 including postage.
12V 5W LED CREE Home Garden Waterproof Day Work Spot Decoration Light Outdoor | eBay

A red one pointing backwards might make a good fog-light!

 

[jerrysimon]

Nice job Dave.

Jerry

 

[RobF]

I've just lashed out on one of these after seeing another rider with one:

Lezyne Macro Drive Front Light | Buy Online | ChainReactionCycles.com

Neat, easy to fit/remove and it charges from USB.

I don't ride a lot at night, but it will also get some use as a hand torch at my static caravan.

The caravan's in rural north Yorkshire, there's no light pollution so it gets proper dark.

 

[wurly]

Just the job. I'm getting tired of charging torch batteries everyweekend. I'm guessing it's a got a driver circuit to enable the thing to run up to 80V input?
I'm getting one....

 

[Fordulike]

Me too. Anyone advise what fuse rating should be used inline for this light?

 

[103Alex1]

Is this likely to drain battery when rigged up but not switched on ? Sounds a no-brainer otherwise. What's the likely relative impact on battery range ?

 

[Deleted member 4366]

I'd put a switch on the main wire to it. If you want a fuse, 1 amp should be enough.

 

[Fordulike]

I'd put a switch on the main wire to it. If you want a fuse, 1 amp should be enough.

Cheers d8veh, the fuse is only going to be added to protect my Cycle Analyst, if the light should short.

I should add, that I have one of those power jack plugs which exits the C.A. and supplies battery voltage to the plug. Gonna mod the light with a jack socket, fuse and switch for a neat solution for a front light.

 

[KirstinS]

Sorry for the silly question but how can it work on anything from 12v to 80v ? Is it simply a matter of more volts = more lumens ?

Very tempted whatever the answer , looks good and must be very bright at 15w

 

[Deleted member 4366]

Sorry for the silly question but how can it work on anything from 12v to 80v ? Is it simply a matter of more volts = more lumens ?

Very tempted whatever the answer , looks good and must be very bright at 15w

It'll have some electronic wizardry that converts and regulates the voltage to the LED, so it'll be the same brightness for all voltages.

 

[NRG]

I suspect there will be some sort of switch mode power supply built in that converts whatever the input voltage is to a fixed output voltage...

 

[103Alex1]

I suspect there will be some sort of switch mode power supply built in that converts whatever the input voltage is to a fixed output voltage...

Pls excuse the basic question, but what sort of impact is powering this off say a 36V battery (20Ah) also used to power your bike's hub motor likely to have on :

1) The power available to relevant motor (assume 30A controller) in terms of its performance; and

2) The cumulative draw on the battery in terms of reduction in its range whilst the light is being powered

??

 

[Geebee]

It will draw approximately .416 amps per hour, so it won't greatly effect range, and close enough to zero effect on power.

 

[Jeremy]

I've been running the lights on one of my bikes direct from the battery for around three or four years now and haven't noticed any effect at all on range. I leave the lights permanently on, so that turning the bike on turns the lights on, turning it off turns them off.

The power drawn by even a fairly powerful set of lights will be only around 0.5% (or less) of the power drawn by the motor, so negligible in practice.

 

[NRG]

^^^^^^^^^^^ What they said!

Pls excuse the basic question, but what sort of impact is powering this off say a 36V battery (20Ah) also used to power your bike's hub motor likely to have on :

1) The power available to relevant motor (assume 30A controller) in terms of its performance; and

2) The cumulative draw on the battery in terms of reduction in its range whilst the light is being powered

??

 

[stesteste]

i put a second set of light from alien 34 pound just joined wires together dont notice any worse battery life. here link to pics
http://www.pedelecs.co.uk/forum/showthread.php?t=12126

Sent from my GT-N7100 using Tapatalk 2

 

[amigafan2003]

I suspect there will be some sort of switch mode power supply built in that converts whatever the input voltage is to a fixed output voltage...

If anyone fancies some techie reading

Buck converter - Wikipedia, the free encyclopedia

 

[NRG]

Or if you would like to build your own...love the videos from this guy!

EEVblog #110 – Let’s Design a DC to DC Switchmode Converter | EEVblog - The Electronics Engineering Video Blog

 

[Scimitar]

That is superb, and if the voltage regulation circuitry isn't wasting too much being run from 36V, it might be worthwhile.

 

[Scimitar]

It will draw approximately .416 amps per hour, so it won't greatly effect range, and close enough to zero effect on power.

If it draws less than half an amp, hours is irrelevant, and has no place.