Does Gearbest sell "guts" that would fit into the pill holder, so I could get everything from one source? Just to practice doing it; I'd buy the Green LED light and a pill holder. Maybe a Blue LED since that's not available as a premade pill?
I just checked. I won't post links because thats not cool here... but. Yes and no. It looks like they have drivers, that are kind of low powered for about $3-$4. Expect these drivers to be lower powered than the one included with the unit. But to give you some idea on what to search for... "17mm driver" Then you're looking for a driver that has a lithium ion voltage range.... somewhere from 2v-4.5v. Since lithium ion batteries have a top operating voltage from 4.2-4.35 volts, that is the most important spec when looking for a driver. If you get a driver that only goes to 3.0-3.7, you might fry the driver with the battery... or over discharge it, etc.
Then you're looking for a LED on 16mm mcpcb. Gear Best carries a few questionable LEDs in this category. I can't say if any of them work. Fasttech has much better options in this category... and they carry the B158, 17mm lithium ion drivers (4.2v), and 16mm LEDs on MCPCBs. You'll want to use a 16mm cree like a: XPL, XPG2, XPE, XPG, XML, or XML2, if you want to make sure its compatible. But yeah, it's best to buy the light at Gear Best and all your parts elsewhere. By the way a decent driver to search for would be the Qlite Rev.A 17mm driver. It won't provide the high output the driver does here, but it's a decent driver that will set you back about $5.