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Powering an LED strip? Answered

Hi,

I am looking to use a small LED strip on my bicycle. Something like the product below. I have no experience with LED strips, and am looking for a way to power them. I want something small & light to mount somewhere on my bike, and wondered what the best options would be? Would a 12V battery pack be suitable (see below). How long would this last roughly?

Thanks!
Dan

LED:
http://www.ebay.co.uk/itm/2x-6LED-Eagle-eye-Super-Bright-White-Flexible-Car-Daytime-Running-Light/151040285688?_trksid=p2047675.m2109&_trkparms=aid%3D555003%26algo%3DPW.CAT%26ao%3D2%26asc%3D29%26meid%3D1853554389978170290%26pid%3D100010%26prg%3D1013%26rk%3D2%26rkt%3D15%26sd%3D271286250637%26

Battery pack:
http://www.ultraleds.co.uk/12v-1-25a-15w-mini-power-supply-ac-dc.html

6 Replies

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steveastroukBest Answer (author)2013-10-10

That's not a battery pack, its a mains power supply. Those LEDs will take 12Watts to run them - that's 12V @ 1 amp. So for every hour you want to run them you want around 1.5aH from the battery - run them for an hour, you need 1.5aH, 2 hours, 3 aH etc etc.

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user

Haha, that's embarrassing! Told you I had no experience. I'd want the lights to run for as long as possible, how big are 4aH batteries likely to be?

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user

If I were you I'd buy a dirt cheap 12V power tool - they often have 4ah batteries.
Aldi, Lidl, B+Q all do deals.

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user

Brill idea. Thank you very much for your help!

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user

Don't forget to tick the Best Answer box. ;-)

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iceng (author)2013-10-10