Commercial Lighting Watts Per Square Foot

Included in the watt measurement is all power consumed by light fixtures ballasts controls transformers etc.

Commercial lighting watts per square foot.

Industrial spaces often require more lumens per square foot because of the complicated potentially dangerous nature of work being performed. Cia world fact book appendix g. Essentially if the component or device is involved in lighting it must be. You would need 4 300 watt fixtures to light the shop.

You can assume a laundry circuit isn t a continuous load and that commercial laundry circuits are rated 1 500va unless noted otherwise in the project drawings or exam question. In our example 650 watts divided by 192 89 square feet is 3 37 watts per square feet. Now is where the thinking comes in. Lighting power density is the amount of power used by lighting per unit of building area.

3 200 x 50 160 000. The formula would look like this. Consider that light spreads and gets dimmer the farther away it. 2409 lumens or 18 watts.

Divide the wattage consumed in the room by its area in square feet to calculate watts per square foot. Commercial spaces like retail stores can utilize many of the same light types but they may not require the same number. According to the department of energy doe the average number of kilowatt hours per square foot for a commercial building is approximately 22 5. Here s the breakdown of how that energy is used.

The nec requires a minimum load per square foot for general lighting depending on the type of occupancy table 220 3 a. In these spaces you ll want to look for shop lights wraparound lights led troffers and high bay lights that have higher output. Multiply the shop s square footage by the suggested foot candle requirement and then divide that number by the fixture s lumen output. Watt per square feet method as per ashrae ansi iesna 90 1 we have two cases for lighting design by using watt per square feet method which are.

In the united states lpd is measured in watts per square foot. This lumen calculation formula is using predefined standard lux levels required for different room types. Imagine 4 lights in your 3 200 square foot shop. Please choose proper unit of your room area to help us count led lights lux and watts calculation required per square foot meter inch.

Approximately 8 kwh square foot are consumed by refrigeration equipment. Today i will explain the third method for lighting design which is watt per square feet method as follows.