Led headlamp 3 Watts
thingiverse
Simple led headlamp 3 Watt for 18650 battery. It good for use with my 18650 battery holder https://www.thingiverse.com/thing:2317031 For make this headlamp I used: - Led Star-3W 290Lm - clear holder (Emitter) Turlens, 23 mm outer diameter - Aluminum strip about 2.2x120 mm (see foto) - Push button switch KAN-15 - Resistor about 0.8-1 Ohm - Thermal grease for good heat transfer from led - 4 screws about 2x10...15 mm - All 3d-printable parts (2 axis) Efficient of this resistor as current limiter is 84-91%. But aluminum radiator in box is to small for 3-Watt led, it is for use at outer temperature <15 degrees C.
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