$15 for an RGB bulb is a disaster, but it did plant the seed for a bathroom light which turned off without turning off the fan.  The lion kingdom leaves the fan on all summer, but the stock light can't be turned off independently of the fan.  It could if it had a remote control.  It has to be a 100W to 150W equivalent, yet there's not enough room to fit such a powerful omnidirectional bulb in the enclosure.  

There are wifi sockets which also wouldn't fit in the enclosure.

https://www.amazon.com/Socket-Intelligent-Control-Support-Network/dp/B07R8KKBR7

https://www.amazon.com/AICase-Intelligent-control-Compatible-Home-White/dp/B07BTQJG6J

There could be a custom solution by combining the guts of a wifi bulb with a COB light.  Highly recommended to use a current limited inverter instead of a wall outlet to test it.