LED LIGHT TABLE MEASUREMENT HOW TO

The lux reading should then be displayed on the display. Holding the light meter above the surface would produce potentially inaccurate readings. It is important the sensor is placed on the surface as this is where the light is reflected into the user eye and represents the true level of light they receive. After taking the cap off the sensor, simply place it on a surface where a task is carried out such as the centre of a desk. You can view our range of light meters here. They are typically small enough to be hand-held and easily carried about.

Light meters contain a sensor that converts the light energy into an electrical charge that can give the user a reading. The simplest way to measure light is to buy a light meter/ lux meter, the two phrases are often interchangeable. Examples of light levelsĪn alternative measurement of light is the foot-candle, this works the same way as lux except 1 foot-candle is 1 lumen per square foot. However if the same light was spread out over 10 square meters, we would only have an illuminance of 100 lux. If we could focus this onto the surface of 1 square metre we would have an illuminance of 1000 lux. One lux is one lumen per square meter.Ī working example, We have a light source whose total light produced (luminous flux) is 1000 lumens. When we measure light, we are interested in how many Lumens fall on a surface this is what we know as lux. One candela per steradian (an area in a cone shape starting from the source of light) is known as a lumen. The base unit of luminous intensity is the candela, (a single lit candle gives off roughly 1 candela). You are probably familiar with the Lumen this is the measure of light intensity people have generally heard of. The total amount of energy of all the light produced is known as the “luminous flux”. The filament is the source of the light and is at the centre of a sphere with light being emitted in every direction. The easiest way to understand how light is measured is by picturing the typical light bulb with a filament that heats up producing light (Incandescent if you read the previous section).

LED lights are a little more complex and achieve white light through a mixture of red, green and blue LEDS or methods similar to Fluorescents.

However, an interaction with a coating on the inside of their tubes makes is visible white light that we can use.

Fluorescent Lights are technically outside of our visible range, they are ultraviolet and below 400nm.

Different temperatures will alter the amount that each wavelength is used.

Incandescent light is radiated electromagnetic energy that is emitted across all wavelengths, when we see all wavelengths things appear white.

Each one of these produces light in a different manner. Types of LightĪs a general rule your workplace will have 1 of three types of light fitting, these are light sources based on heat know as incandescent, Fluorescent lights and LED’s. When energy is emitted across all 3 of these wavelengths at once we get what we know as white light. Both have uses in different types of technology. Infrared is when the wavelength are longer that what we can see and ultraviolet when they are shorter. You may have heard the terms infrared and ultraviolet. Individual colours are present around certain wavelengths. These wavelengths exist between 400 and 700nm. Human beings have receptors that can sense particular wavelength’s and process it into images. These waves have both a wavelength and a frequency.

Light is a form of electromagnetic energy that travels in waves.

LED LIGHT TABLE MEASUREMENT HOW TO

What is Light?įeel free to skip this section, as it isn’t vital to understanding how to measure light correctly but is useful supporting information.

Measuring light comes with a few considerations this article offers a basic introduction to what light is and how it is measured along with a guide on how to use a Light Meter (Luxmeter). Measuring light has become a common practice in various walks of life, from making sure your employee’s are operating in safe working conditions to checking lighting levels for photography or set design.

Led light table measurement