* A lumen is the same as Lux and is what many modern light meters will calculate their measurement in. The next step is to calculate the number of watts. One lumen is = 0.001496 watts. This is pretty simple, after you have your total number of lumens from step 2.
Quick Answer. The formula for speed is s = d/t, where s equals the speed, d is the distance covered and t is the time it took to cover the distance. The formula for finding the instantaneous speed at a specific point is found by taking the derivative of the speed equation. Continue Reading.
Speed and velocity are two closely related terms in physics which tell how fast an object is traveling. They are both measured by dividing the distance traveled by the time it took to go that far. The units are miles per hour, meters per second, feet per second, or any measure that is distance per unit time. The difference between speed and velocity is that speed is just a number which indicates how fast something is going. Velocity is that same number, but also tells in what direction the object is going.