# How Many Watts Per Square Foot For Lighting? (Resolved!)

Generally, light bulbs use between 2 and 100 watts (W) of electricity, depending on the size and type. Light bulbs have a lifespan of around 10,000 hours and use 25 to 100 W. LEDs are much more energy-efficient than traditional bulbs and can last up to 10 times as long. LED lights can also be dimmer, making them ideal for dimly-lit rooms.

## How many lumens of light do I need per square foot?

As a handy rule of thumb, a sitting room or bedroom will generally require around 10-20 lumens per square foot, while a bathroom or kitchen will need a stronger level of lighting, usually around 20-30 lumen/square foot. Lumens are measured in candela, which is a measure of the amount of light emitted by a light source.

For example, an incandescent light bulb emits about 1,000 candelas per watt, and a fluorescent lightbulb emits around 2,500 candels/watt. So, if you have a 100 watt bulb in your bathroom, you would need to have at least 100 candellas in the room to get the same light output as a 50 watt light fixture. This is why it’s so important to choose a fixture that will give you the best lighting for your space.

## What is the wattage per square foot?

The power required by electrical heating is calculated in watt. Divide the area in feet by 10. For example, if you have a 20-foot-by-20-feet room, you would need to heat the room by 400 watts for every square foot of floor area. If you were to use a 1-inch-thick sheet of plywood, this would require a total of 2,400 watts of power.

## How do you calculate light wattage for a room?

To calculate the lighting lumens (formerly wattage) needed in any room: Multiply width of room x length of room x 1.5 = amount of total minimum wattage needed (assuming an eight foot ceiling). To find the number of 60- watt equivalent bulbs needed per square foot of floor space, divide by 60.

For example, if a room has a ceiling height of eight feet and a floor area of four square feet, then the total lighting requirement for the room would be: (8 x 4) / (4 x 8) = 1,000 watts.

## How do you calculate lighting per square foot?

Multiply your room square footage by the footcandle requirement. If you have a large room with a lot of windows, you may want to consider using a dimmer switch to reduce the amount of light coming into the room. You can also use a timer to turn off the lights when you’re not using them.

## How much area will 3000 lumens light up?

You will need to divide your room square footage by your room foot-candle requirement to determine the needed lumens. A 100 square foot dining room, which needs 30-40 foot-candles, will need 2,500-3,200 light. For more information, please visit our Lumens Calculator.

## How many lumens do I need for a 20×20 room?

Let’s you have a six-light pendant with 9W led bulbs that put out over 800 lumens each. That’s a lot of light, but it’s not enough to illuminate the entire room. The first is to add more light-emitting diodes (LEDs) to your lightbulbs. LEDs are much more efficient than incandescent bulbs, and they’re also much cheaper to buy and install.

You can find LEDs for less than \$1 per watt, which is about half the cost of a standard bulb. If you want to go the extra mile and add a few more LEDs, then you’ll need to invest in a more powerful light source, such as a compact fluorescent (CFL) light bulb or a high-efficiency halogen (HHO) lamp.

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