I have a light fixture that is flush mounted in the ceiling of an exterior porch, I would like to add two more twin bulb floodlights switched by the existing switch if this is okay to do. If so can I run wiring from the current fixture through conduit along the undersides of the eaves, and if so should I use metal conduit or pvc? This is an 8 year old subdivision house if it makes any difference. Thanks in advance.
Paul

Add all the intended wattage on paper, and compare to the capacity of the switch and power supply wiring. You shouldn't exceed any capacity from the fuse or breaker forward, and never "over-fuse". Any unauthorized modifications, not officially certified by a licensed inspector will void your insurance... Please be careful...