Where can you buy a disco light Those lights in the skating rink A big round ball looks like Epcots energy exhibit?
They are "Disc Balls". Made of mirrors and hung from above the dance floor they had a small motor that turns the ball. Spot Lights are pointed at the ball and bounce off to the floor and walls around the dance floor. Amazon sell them - There are more sophisticated types that have coloured lights on a small gantry around the ball which move through the vertical and horizontal giving greater changes to the light effect.
What lights must power-driven vessels less than 65.6 feet long and underway between sunset and sunrise exhibit?
Not sure if this is what you mean, but here is two scenarios . International Rule 23 Lights and Shapes (ii) a power driven vessel less than 7 meters in length, whose maximum speed does not exceed 7 knots may in lieu of the lights prescribed in paragraph (a) of this rule exhibit an all around WHITE light and shall, if practical, also exhibit side lights; Inland Lights and Shapes Rule 25 (d) (i) A…
The diagram below shows a picture of a slankey diagram. Energy is weighed in kj (kilo joules). the electrical energy represents how much energy you started with. The light energy represents how much energy you used for the lights. The heat energy represents how much energy you did not use for the lights but you used it for heat.
according to Mythbusters, turning your lights on and off is the way to go. there is an almost unmeasurable amount of energy used when you turn you lights on because it is so small. leaving your lights on all the time wastes far more energy then turning them off when you leave the room and turning them back on when you come back.
To power bicycle lights w/o having to rely on batteries. It can provide electric energy to a set of lights on your bike w/o relying on batteries. It turns mechanical/kinetic energy from the bike's movement into electricity that can be used to power the bike's lights. It provides electric energy to a set of lights on your bike w/o relying on batteries.