Lighting Consumption = The Sum of the Wattage from all fixtures * Hours usedĪssuming your room is lit by two 100W bulbs for 6 hours a day. > But that is only if all the fixtures have the same wattage if not, the formula will be: Lighting Consumption = Number of fixtures * Wattage * Hours used Once you have a cost rate, the next step would be to calculate your lighting consumption. If at the end of the month, you receive a $100 for using 1000 kWh of electricity, your cost rate will be: To find out how much you pay for every kWh used, you can use this formula: That will give you a final result in the format X Watts per Meters the efficacy of light at your point of interest.īecause the formula and procedure are quite straightforward. Step 6: Finally, divide the wattage of your light source by the final figure you obtained in step 5 to get a value X. Step 5: Now, to get the efficacy of light in your point of interest, you’ll have to multiply the answer you get above by pi (3.142) again. Step 4: Multiply your SA from step 3 by 4 again. To do that you use the formula “ SA = 4 * pi (3.142) * D 2 ”. Step 3: Since light is often distributed in the form of a sphere, you’ll have to find its surface area. Step 2: Measure the distance “ D” (in meters) between the point of interest and your light source. Step 1: Determine the light source’s watt consumption using an LED wattage calculator. With that in mind, here are the steps to take to quickly determine efficacy:
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