Question: How Do You Read Foot Candles?

How do you calculate lumens per 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 many foot candles is daylight?

1,000 footFull 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 watts is a foot candle?

You can also calculate the number of watts directly from the foot-candles by combining both equations and using the following: Watts = Foot Candles x 0.01609696 This is because 10.76 x 0.001496 = 0.01609696).

Is a lumen the same as a foot candle?

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 lumens is a 30×40 shop?

30X40=1200sqft X 100 Lu = 120000 /2600 = 46 T8 32W tubes or 12 4 tube fixtures. 2600 lumens per 32W T8 tube is about average.

What is Lux mean?

luminous flux perThe lux (symbol: lx) is the SI derived unit of illuminance, measuring luminous flux per unit area. It is equal to one lumen per square metre. … In English, “lux” is used as both the singular and plural form. The word is derived from the Latin word for “light”, lux.

How strong is 100 lumens?

100 lumens is considered bright enough for most walkways — including commercial properties. 100 lumens is equivalent to about 20 watts.

How many foot candles does OSHA require?

5 footFoot-Candles in the OSHA Standards. In standard 29 CFR 1926.56(a), OSHA lists the minimum amount of light for operating zones encountered in the construction industry. For warehouses and similar indoor spaces, this standard requires illumination of at least 5 foot-candles.

How many watts is 1000 lumens?

Lumens to watts tableLumensIncandescent light bulb wattsFluorescent / LED watts900 lm60 W15 W1125 lm75 W18.75 W1500 lm100 W25 W2250 lm150 W37.5 W3 more rows

What is a foot candle light meter?

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. … Store environment: 5 fc.

How many foot candles is bright indirect light?

1000-2000 foot candles1000-2000 foot candles of light are considered bright indirect light.

How do you use a foot candle light meter?

To measure the intensity of the light, press down the measurement button when the meter is pointed towards the camera and in the same light as the subject. Hold the button down until your meter confirms that you have measured the light in that area correctly.

How many candlepower is a 60 watt bulb?

Your average 60 watt household light bulb produces 650 to 700 lumens when burned under standardized conditions. Therefore you can estimate that a 60 watt household light bulb, burned under average household conditions might produce somewhere between 50 and 55 candle power, give or take…

How many lumens is 100 square feet?

To determine the needed lumens, you will need to multiply your room square footage by your room foot-candle requirement. For example, a 100 square foot living room, which needs 10-20 foot-candles, will need 1,000-2,000 lumens. A 100 square foot dining room, which needs 30-40 foot-candles, will need 3,000-4,000 lumens.

How strong is 5000 lumens?

For the average living room of 250 square feet, you’ll need 5,000 lumens as your primary light source (20 lumens x 250 square feet), equivalent to about five 100 watt incandescent light bulbs, five 23 watt CFLs, or eight 10 watt LED light bulbs.

How many foot candles are in a 100 watt bulb?

400 foot candlesTheir 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 many foot candles is low light?

Plants referred to as low light intensity plants generally should receive between 50 and 250 foot-candles. Medium-light plants prefer 250 to 1,000 foot-candles. Best growth occurs above 750 foot-candles unless plants also receive extended periods of direct sunlight.

How bright is 40 foot candles?

In some areas, foot-candles will be higher than 40, and in other areas, it will be lower, but it will average out at 40. You’d need a fixture or multiple fixtures combined that will give you about 40 lumens of light per square foot.

How many foot candles does a monstera need?

Medium light intensity plants prefer 250 to 1,000 foot-candles. Best growth occurs above 750 foot-candles unless plants also receive extended periods of direct sunlight.

How do you convert Lux to Watts?

P (W) = Ev (lx) x A (m2) / η (lm / W). It means that the power in watts is calculated by multiplying the illuminance in lux by the surface area in square meters. The result is then divided by the luminous efficacy in lumens per watt.