Most people like myself in showing off a light usually need less than 10 minutes to "show off" a light. In thinking of terms like a special effects Hollywood mega torch effect its conceivable to build something that has such a blinding effect albeit temporary at the cost of short duration, battery packs or concealed power supplies. For a functioning tool you will be expected to spend several hundreds of dollars easily, but with an 8D truck battery, a 2000W inverter and an industrial MH lamp with a homemade reflector fabricated from a bowl out of a restaurant supply house anything is possible. For just bragging rights then you need to use unique imagination and thats as rare as hens teeth nowadays.