this sounds complicated ,bit concerned about light switch under the metal plate !!!!!!! right Firstly is the light switch exposed to rain,or is it IP rated(sealed) and suitable for outside use.
the wiring what it should be is the PIR light is first on the circuit from the main house lighting circuit or via a fused spur then connected to the live neutral and earth connections and for the other lights across the lamp connects on the terminal block normally white braided wire is visable and in most case a fourth terminal is provided,,these then link to the next light (brown)neutral (blue) earth (green and yellow) and then to the next light ,so when the PIR switches on all the lights come on ,but be careful of the loading as 3 x 500 watt halogen lights is 1500watt which will over load your PIR and lighting circuit the lamp size can be reduced to 200 watt or the smaller 150 watt if lamp holder will accomodate
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