* 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.
1 Speed is solved when you divide distance by time. 2  The speed is simply a measure of the movement over time, rather than a direction. 3  Velocity is figured when you take the displacement of an object, with its direction divided by a change in time.4  It requires a direction. Speed is solved when you divide distance by time. 2  The speed is simply a measure of the movement over time, rather than a direction. 3  Velocity is figured when you take the displacement of an object, with its direction divided by a change in time. 4  It requires a direction.