Disrespective: That LumenCache system looks interesting. I'll need to look into it more but if all the lighting is running off Cat cables is there allowance to also send data/smart info off the same cable?
Also, if retrofitting the system by adding another light, can it be daisy chained into the system or will it require running another line?
Yes, there is potential to have data sent down the cables, they have plans for smart sensors and control options using the "data" pairs. At present, you can run both power and switching down the single cat# cable.
Light fixtures can be "daisy chained", as long as the load does not exceed 16 watts on the driver, the best way is to run a new circuit, if this can be done. Every home should be designed for this type of situation.