I'd like to add a second low wattage external light (9 watt +PIR/100 floodlight) to an external garage wall. The existing light is on a fused connection unit on a spur cable taken from the garage light circuit (all garage circuits RCD protected). To add a second identical light, can I put a junction box on the flex from the FCU to the first light and wire both lights to the junction box? Both would then be supplied via the FCU.