One lux is equal to one lumen per square meter, and they vary from lumens, which calculates the brightness of the source of light. Lux meters seem cheap enough but I doubt the ones for sale on eBay and Amazon are sensitive or accurate at the light levels you are interested in. Therefore, 1 LUX = 1 Lumen / m2. 200 lux – Entrance areas and lobbies require this level of light, and it is also the minimum for a restaurant dining area. It is at its greatest near the bulb and diminishes rapidly as it moves away from the light source. The 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. Many indoor plants will thrive in these light conditions. Light intensity is the magnitude of light energy per unit of area. How to calculate lux levels? Some light units are based on the human eye’s perception of light. NOTE: If you’re used to working with lux or are using an instrument that only measures lux, please note there’s a direct conversion between the two units of measurement. Photosynthetic Active Radiation (PAR) is a term that refers to the amount of light within the 400- to 700-nanometer wavelength range. Bright, Indirect Light: (10,000–20,000 lux; 1,000–2,000 foot-candles). Low – range 270 to 807Lux. For example, plants that are 2 feet from a lamp receive 1/4th of the amount of light received by a plant 1 foot away from the lamp! Low Light: (2,500–10,000 lux; 250–1,000 foot-candles) Natural light when several feet from an east-facing window on a bright day. 75° flood: 3270 lux/303.8 fc at 2.99′ / 0.91 m. Light is measured in lux and fc at a distance. Let’s go over the first line to see how this conversion works. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface. A process control room should be lit at an illuminance of 300 lux, a corridor or walkway may only require 50 lux, whilst studying an engineering drawing may require 750 lux (see HSG38 Lighting at … Footcandles, lux, and lumens are in this category. Different activities require different levels of light. In the middle area its may be as low as 25 - 50 lux. A light meter measures levels of illumination, in Lux (Lumens per square metre). 500–1,000: Still low light intensity, but bright enough to read by, like the natural light of an ordinary room, good for shade-loving plants 1,000–2,000: Bright but indirect sunlight, may not produce a clearly defined shadow, but is good for many types of plants that require indirect sunlight Recommended Light Levels Common and Recommended Light Levels Indoors The outdoor light level is approximately 10,000 lux on a clear day. Lux: The amount of light that is cast on a surface is called illuminance, which is measured in lux.This can be thought of as light intensity within a specific area. In the specs above the lux and fc are measured at a super close to three feet. Water Requirements: Dry – Does not need very much water and can stand low humidity. 1 lux = .0929 foot-candle I want to know how many stops brighter 9050 lux is than 1000 lux. Medium – range of 807 to 1614 Lux. Most shade tolerant indoor plants will do well. In general, the more detailed the task, the greater the light requirement. High – range 1614 to 10764 Lux. The more expensive ones have a range of 0 to 200,000 lux in four ranges (0-2000, 0-20000 etc.) Lumens: The total output of visible light from a light source is measured in lumens.Typically, the more lumens a light fixture provides, the brighter it is. with an accuracy of +/-5%. 300 lux – Assembly Areas, like village halls require at least 300 lux; 500 lux – Retail spaces should have this as a minimum light level, as should general office spaces. Enough light should be provided in the area so that people perform their tasks without any mishaps and hassles. In the building, in the area closest to windows, the light level may be reduced to approximately 1,000 lux. Once we have a hard numerical measurement of the intensity of light in a space, we can start looking at what plants would do well. A super close to three feet many stops brighter 9050 lux is than 1000 lux the first to... Flood: 3270 lux/303.8 fc at a super close to three feet SI! 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