# How many watts is a foot-candle?

## How many watts is a foot-candle?

Foot-candle to Watt/sq. Cm (at 555 Nm) Conversion Table

Foot-candle [ft*c, Fc] Watt/sq. Cm (at 555 Nm)
1 ft*c, fc 1.5759751708199E-6 watt/sq. cm (at 555 nm)
2 ft*c, fc 3.1519503416398E-6 watt/sq. cm (at 555 nm)
3 ft*c, fc 4.7279255124597E-6 watt/sq. cm (at 555 nm)
5 ft*c, fc 7.8798758540995E-6 watt/sq. cm (at 555 nm)

How many foot candles is a 100 watt bulb?

Their efficiency is in the range of 4 lumens per watt. This means that a 100 watt bulb will generate 400 lumens – TOTAL. (Here’s the big leap) Now, if we COULD reflect all of that 400 lumens onto 1 square foot we would get a light intensity of 400 foot candles.

### How do you read foot candles?

Picture a candle set in the middle of a sphere measuring 0.60 meters (2 feet) in diameter. If we cut a hole that measures 0.09 square meters (1 square foot) in the centre of this sphere, the light that shines through is what we define as a lumen. A foot-candle equals one lumen per square foot.

How many watts is a candle?

A candle typically produces about 13 lumens of visible light and 40 watts of heat, although this can vary depending primarily on the characteristics of the candle wick.

#### What is a candle watt?

Candlepower (abbreviated as cp or CP) is a unit of measurement for luminous intensity. It expresses levels of light intensity relative to the light emitted by a candle of specific size and constituents. The historical candlepower is equal to 1.02 candelas.

What are 1000 foot candles?

Full daylight typically equals about 1,000 foot-candles, while an overcast day would have only 100 foot-candles of light. Twilight produces just 1 foot-candle, while a night with a full moon has 0.01 foot-candle and an overcast night has only 0.00001 foot-candle.

## How many foot candles does it take to manufacture?

A requirement of 20 foot candles is recommended for general spaces in offices. In areas where reading and detailed tasks are carried out, 50 foot candles of lighting is sufficient. Conference rooms and other areas where visually challenging tasks are occasionally performed may incorporate between 10-20 foot candles.

What is the equivalent of lumens in Watts?

Lumen and watt units represent different quantities, so you can’t convert lumens to watts….Lumens to watts table.

Lumens Incandescent light bulb watts Fluorescent / LED watts
1125 lm 75 W 18.75 W
1500 lm 100 W 25 W
2250 lm 150 W 37.5 W
3000 lm 200 W 50 W

### How do you calculate candle power?

Divide the lumens rating by 12.57, using your calculator. For example, if your lamp is rated at 12.57 lumens, divide by 12.57 to determine that it has an output of 1 candlepower. If your lamp is rated to 25.14 lumens, it has an output of 2 candlepower.