I would think if you never plan to sail at night the original Pearson light may be fine with an LED bulb.
When I look at the nav lights I'm thinking...... Man, I hope I never come across a boat at night in a channel or sea with lights this small and have to determine it's intentions. I would think an upgrade would be in order if your plan is to be on the water after the sun has gone down. They may be proportionate to the size of the boat but they sure would be hard to see. I'm thinking something with twice the lens size would be in order.
Comments?