Never heard of the "Photon" and "Electron" boards, but it's pretty easy to guess that the CANdlestick board product is a CANbus interface, designed for people with a level of electronics skill suitable for Arduino style projects. I wouldn't have any use for it personally but it's easy to see where this product might be useful if I had a newer car and wanted to tinker with it.
Exactly! Interesting your comment about a newer car. What model year is your car?
It's a '92 Range Rover. Not sure if it has a CAN bus but even if it does I doubt there's anything interesting to be done with it.
Nice! Yeah the OBD-II protocol was required on vehicles manufactured after 1997. Not sure if it has a CAN bus, is it fuel injected?