the light force lamps do have a tighter beam pattern,ie,,the cluson light has a horizontal bulb filament,giving a rugby ball shaped beam were as the light force has a virtical bulb filament giving a perfectly round beam patern.
ps
if any one has recently bought lightforce bulbs from arthercarter fieldsports it might be worth checking them as i bought two at the welsh show,they wasnt genuine bulbs!!!!!! the was normal halogen type(that go in traffic lights) that u can buy for about £4 from electrical stores
regards asme