14 gauge wire will be more than enough to handle the current of two 18 watt loads. Each lamp would draw 1.5 amps, so that's 3 amps per PAIR. Note that if the lights are rated at 12 volts, they'll probably draw about 1.8 amps each at 14 volts. (This depends on how they're internally regulated; the current could be LESS at the higher voltage, but you need to consider the worst case.)
Since 14 gauge wire is normally considered to be good for up to 15 amps, it should be good for up to eight of these lamps, each drawing 1.8 amps. Assuming you use a pair of wires from the fuse box to the lights, you will see the following voltage drop: 1 pair (3.6 amps): 0.2 volts 2 pair (7.2 amps): 0.4 volts 3 pair (10.8 amps): 0.7 volts 4 pair (14.4 amps): 0.9 volts
The voltage drop will be half that if you ground the lights locally AND you have a GOOD GROUND. You might want to bump up the wire size if you need to run a bunch of these lights, but half a volt drop is no big deal.
Alternatively, if you're only going to run a single pair of these lights, you can get by with 16 or even 18 gauge wire. Use a 10 amp fuse max for 16 gauge, 7.5 amp for 18.
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