If yours is a tail dragger, it's pretty much needed to have two lights. One aimed for landing configuration, (to light up the runway on approach), & the second would be aimed lower for effective Taxiing.
If you are an 'A' model, you could get away with one landing light, aim it about 150ft down the taxiway for taxiing & it is about the right angle for seeing the runway on approach.
Adding the second light does look better, offers better lighting & recognition, does give the option of WigWag for more safety, & wire really doesn't weigh that much...
As for the surplus amperage item mentioned above, he is talking about totalling up all the power requirements of all your onboard equipment (radios, efiss, boost pumps, lights, pitot, etc) & seeing if your alternator can keep up with some surplus safety factor.
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Ralph
built a few RVs, rebuilt a few more, hot rodded some, & maintained/updated a bunch more
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