Led headlamp 3 Watts

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 cur