# What are foot candles in lighting?

## What are foot candles in lighting?

Footcandles are the most common unit of measure used by lighting professionals to calculate light levels in businesses and outdoor spaces. A footcandle is defined as the illuminance on a one square foot surface from a uniform source of light.

## What is a good foot-candle?

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.

How do you identify foot candles?

Multiply the Length times the Width of the Room to get the Room Square Footage. For example, if the room is 10 feet wide and 10 feet long, the Room Square Footage will be 100 square feet. A foot-candle is how bright the light is one foot away from the source.

### Why is it called a foot-candle?

The name “footcandle” conveys “the illuminance cast on a surface by a one-candela source one foot away”. As natural as this sounds, this style of name is now frowned upon, because dimensionally illuminance is not length times luminous intensity as the name would imply but instead luminous intensity per unit area.

### How many foot candles does a plant need?

Plants referred to as low light intensity plants generally should receive between 50 and 250 foot-candles. Under artificial light, a few plants in this group can be maintained at as little as 10 foot-candles. Low-light plants should receive between 10 and 15 watts of fluorescent light per square foot of growing space.

How many foot candles is daylight?

1,000 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.

#### Is lux and foot-candle same?

Foot-Candles & Lux Foot-candles and lux measure the same thing—the amount of visible light that falls on a surface. The difference is that the foot-candle uses the Imperial standard measuring system (feet, pounds, etc.), while the lux uses the metric system (meters, grams, etc.).

#### How does a foot-candle work?

A foot-candle equals one lumen per square foot. This is a British measurement. Using the metric system, a lumen is measured by a square meter or a lux. Thus a foot-candle is equivalent to approximately 10 lux or 10.57 lux.

How many foot candles is direct sunlight?

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 is indirect light?

1,000 to 2,000 foot-candles
50 to 250 foot-candles: Low light. 250 to 1,000 foot-candles: Low to medium light. 1,000 to 2,000 foot-candles: Bright, indirect light.

## How many foot-candles do my plants need?

How many foot candles do succulents need?

Succulents do best when exposed to between 3,000 and 4,000 fc (foot-candles), where as cacti do best when exposed to between 4,000 and 5,000 fc.

### How many foot-candles is sunlight?

How many foot-candles is full sun?

To better understand lighting levels and what these figures mean, think of some typical natural lighting situations. Full daylight typically equals about 1,000 foot-candles, while an overcast day would have only 100 foot-candles of light.

#### How to calculate foot candle?

Lamp Life

• Lamp Burnout Factor
• Group Relamping Cost
• Cleaning Cost. Average Reduced Air Pollution (lbs. Carbon Dioxide) = Energy Savings (kWh) x 1.6 lbs. Average Reduced Air Pollution (g.
• #### How many footcandles equal a lumen?

How many foot candles are in a lumen? One foot-candle equals 10.76 lumens (a lumen is considered the same as lux, which is what most modern light meters calculate their measurements in), so in order to convert your foot-candles to lumens, you will need to take the amount of foot-candles measured and multiply by 10.76 to get the number of lumens.

What does 10 foot candles mean?

One foot-candle is equal to approximately 10.76 lux. In practical applications, as when measuring room illumination, it is often not needed to measure illuminance more accurately than ±10%, it is sufficient to think of one foot-candle as about ten lux.

## How bright is 5 foot candles?

Public areas surrounded by dark areas will generally require 2 to 5 foot-candles, or 20 to 50 lux, while typical offices and classrooms without highly detailed work will need 10 to 20 foot-candles, or 200 lux. Offices with more intensive use and showrooms will need brighter lighting provided by 50 to 100 foot-candles, or 500 lux.