My lightforce spotty has a 30 watt globe and beams out to 120m-ish for about 2 hours. the battery is the same size as a motorcycle battery. It came a a walkabout pack with battery, light, charger and carrypack.
A good reflector will compensate for a lower wattage globe. Thats why super cheap needs 1.5 million candle power where as mine needs 300 000 as it is a better reflector.
Beno