Your alternator is rated at 147 watts at 5000rpm. Figure the total wattage of all the lights (including the ones you intend to add) then allow at least 50 watts for charging the battery. If you exceed the wattage of the alternator, you may have less than full brightness of any of the lights, a battery that dies while you are driving or (worst case) a burned out alternator and/or burned out rectifier/regulator.
If you just have to have blazing hi-intensity lighting, take the alternator out, send it to a rewind shop and have it wound for higher output.
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