How many hours should bike lights last?

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John

Ive just bought a bike with halfords bike lights. I was just wondering how long the battery last on average? Is it a couple of hours or 100's?

Answer
It should state the expected running times on the packaging. If the lights were fitted to the cycle when you got it, and it was new, you should at least have been given the instructions.
LED lights usually last for something like 30 hours on steady, and 60 hours when flashing, lights with bulbs will last for considerably less.

I've attached a link to the lights section of the Halfords web site, and some of the lights have their run times in the description.

How come when i hook up this 12volt 50 watt halogen bulb it doesnt light up?

Sdfaad

So I wanted to make a bike light so i bought a halogen bulb the rquires 12v 50 watt power. I put some batteries in series to make 12volts but when i connect the bulb it does nothing. why doesnt it do anything>? I even stepped up the volts to 18 with two 9 volt batteries but still nothing. Any ideas?

Answer
50 watts is a lot of power for most batteries. It is likely that your batteries have too much internal resistance and cannot deliver the amount of current required.

To determine this, connect a voltmeter across the light when you connect it the batteries. You will probably see that the voltage drops to much less than 12 volts.

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