Mod: Convoy L4, a good mod host? Is it even necessary to mod?

I have not tested, and even if I did test and there were no signs of water inside the light, I would not dare to guarantee it.. If you plan on having the light under water while doing mode changes then I would recommend a dive light just to be on the safe side.

Y3 with XM-L2 and direct drive driver could break 100kcd with an XM-L2.. Check out the Y3 thread.

Y3 and L4 both requires some extra work to get the full potential out of. Its not just a direct driver swap, you have to use the existing driver as a contact plate/switch holder. Its more involving compared to just a basic driver and emitter swap in a C8 light. On the Y3 also comes extra work with raising the emitter.. Again, check that thread for more mod info on it.

In general, if you are new to modding, its easier to start with the more basic stuff, but that is up to you and your skills.