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Hello, if you want more power run the turbine faster by reducing the pitching weights or by increasing the spring stiffness. With extra speed comes extra risk of course, the turbine will vibrate more and this could lead to the failure of the printed parts and release of high energy debris. Any modification is at your own risk.

I'm not sure what you mean by to weak for small lighting, the turbine will produce 5watt and can power a 5watt bulb, from the graphs in the instruction manual you can see the power output curves. During testing I ran the turbine well beyond 1200 RPM! it just vibrates a lot and with better materials (ABS) would be ok but i'm not so sure with PLA its rather brittle.