I would not recommend this power module for a bike light simply because it is so large. It will work but there are much better options.
Honestly for a bike light you could very easily use a simple flashlight driver to do what you need at a fraction of the weight and size.
There are lots of drivers that will do what you want, just search around.
A driver such as my own Texas Avenger series (see my sig) would provide all the output you could want in a compact package. It includes low voltage protection as well.
If you want simple I would just use a few 18650 batteries in parallel for runtime.
The batteries will be the largest part except for the heat sink you will need for the LED’s. 4 XM-L2 driven well will overheat in a hurry, so you will need a good sized heat sink for sure. You can also add as many 18650’s as you want in order to get the runtime you want as well. I am pretty sure there are some nice bike light builds on here, I would read through those. It is not my thing personally so I don’t know what others are doing.