Rather than splash out on an Exposure Revo dynamo light has anyone tried directly running a usb rechargeable light such as the Niterider Lumina 700 off a dynamo. Seems like a neat way of saving some money whilst getting a much longer stand light too.

I’ve considered this but if it works anything like my Niterider 250 then the light cuts off when the USB cable is plugged in. That means you are limited to the length of one full charge. Might work out OK if the nights are short, though I’ve not seen anything that would let me work out if the dynamo would fully recharge the light in the course of a days riding.

I suspected that might be the case. The light would definately need to work whilst on charge. I’ll experiment with my moon rear light tomorrow and see if it works but it’ll probably need to go via a regulator first which wouldn’t be ideal as I’d need that for my phone.

Let me know how you get on?

yep sure will

I think I did try it with an Exposure light one, I forget. If I recall, you’ll not get anything like enough current out of the USB charger end of things to keep a front light going indefinitely, but you may extend its life if it’s capable of charging whilst the LED is on. I may be wrong.

Alternatively, if this is for road use, have a look at the German lamps – B&M are your best bet. About £50 gets you a Cyo.

http://supernova-lights.com/en/products/airstream_int.html

Can be charged while in use.