Originally Posted by CEBEP

Unfortunately I’m not home at the moment and can’t measure Edelux II. But if it will fit, then changing front light to Edelux II and along with it adding rear light on the rear rack will probably be the best upgrade of dynamo lights you can get on Birdy. There will also be minimum possible drag on SP dynamo as it will automatically switch itself and rear light off during daytime (no daytime light).