The simplest of conversions, a 3W Lux III LED, and a bridge rectifier. No standlight. The lens is 25x6 degree. Gives a nice wide spread which my Planet Bike dynamo light seriously lacked, but doesn't throw the light very far. I have other lenses I can play around with. Ideally I would like to keep the 25x6, and add a second LED with a narrower beam, but there is not a whole lot of room in the housing. I could maybe make a rectifier out of diodes to save some space and fit a second LED.