What is foot-candle formula?
What is foot-candle formula?
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.
How is foot candles measured?
A foot-candle (or foot-candle, fc, lm/ft2, or ft-c) is a measurement of light intensity. One foot-candle is defined as enough light to saturate a one-foot square with one lumen of light. Unobstructed sunlight: 10,000 fc. Overcast sunlight: 100 fc.
How many foot candles do I need?
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.
How do you calculate square feet for 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. Determine the Foot Candles by Room Type or Room Purpose….Key Terms.
| Room | Foot Candles Needed |
|---|---|
| Bathroom | 70-80 |
How many lumens is 300 square feet?
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, at around 70-80 lumens per square foot. To work out the lumens you need, simply multiply the square footage of the room by this figure.
How do you find the light intensity of a foot-candle?
Calculation Cheat Sheet:
- To calculate Lumens (Lux) from foot-candles: Lumens = Foot Candles x 10.76.
- To calculate Watts from foot-candles: Watts = Lumens x 0.001496.
- You can also calculate the number of watts directly from foot-candles by combining both equations & using the following: Watts = Foot Candles x 0.01609696.
How do you calculate candlepower?
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.
What does 5000 lumens mean?
For example, in a small room, 5000 lumens will feel a lot brighter to the eyes than in a larger room double that size. While a room of 250 square feet will usually require 5000 lumens, it is important to note this is for general lighting and you may still need to add additional light around the room.
What does lux mean in lighting?
illuminance
Lux is a standardised unit of measurement of light level intensity, which is commonly referred to as “illuminance” or “illumination”. One lux (1 lux) of light is a measure of the light density, equivalent to 1 lumen per square metre (lm / m^2).
Are lumens the same as lux?
Lux is used to measure the amount of light output in a given area – one lux is equal to one lumen per square meter. It enables us to measure the total “amount” of visible light present and the intensity of the illumination on a surface.