How carry out you ascertain the illumination level required for miscellaneous applications to achieve optimal light and safety and visual comfort? We often buy our irradiate bulbs follow to your watt intake without knowing the quantity of irradiate they project. How do we measure light? In the light industry, we often speak that foot-candles, lumens, and also lux. The following are simple references the will help you measure up light.

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Here is a straightforward illustration that will assist you understand the foot-candle measurement. Imagine setup a candle in ~ a distance of 0.30 meters (1 foot) indigenous a flat wall on i m sorry we’ve drawn a square shape measuring 0.09 square meters (1 square foot). One lumen every square foot will illuminate this surface.

Foot-candle is the most widespread bright measurement in the industry. Why execute we quiet use words “candle” to measure light in this day and age? The explanation for this choice dates back to the beginnings of the candle itself. Once people started to measure up the strongness of light, candles to be the most common light source available.

At the time, the candle-making industry provided a consistent, steady, clean, and efficient means to measure light. Thus, we use this popular expression, even to this day.

Lumen and Lux

The lumen is a far-ranging entity: it procedures the full amount the visible light emitted through a given source. Every other dimensions are based on the lumen.The lumen measurement originated from the basic concept that foot-candles. It can be illustrated, much more or less, by the image presented here. A more scientific meaning exists today, but this illustration helps visualize the lumen.

Picture a candle collection in the middle of a round measuring 0.60 meter (2 feet) in diameter. If we cut a feet that measures 0.09 square meters (1 square foot) in the centre of this sphere, the light the shines with is what we specify as a lumen.


A foot-candle equals one lumen every square foot. This is a brothers measurement. Making use of the metric system, a lumen is measured by a square meter or a lux. Thus a foot-candle is indistinguishable to approximately 10 lux or 10.57 lux.

A higher number the lumens room indicative of a brighter, an ext intense light, conversely, a lower variety of lumens represent dimmer, more subdued lighting.

How to measure a Lumen or a Lux

In reality, lumens room quite challenging to measure: laboratory tests are usually required. Consequently, if you want to understand the variety of lumens projected by your lamp or fixture with combined bulb, you might want to refer to the product packaging or above the luminaire catalogue.

Transition from watts to lumens

It walk make any sense to evaluate the amount of light according come the watt consumption of the lamp. When you desire to replace a light bulb, follow this straightforward rule of ignorance to convert watts to lumens, and vice versa.



How much Lighting do You Need?

Ordinarily, we establish the optimal light requirements based on the need for suitable foot-candles. How have the right to you determine the best amount the lighting because that your details application? The Illuminating Engineering culture of north America (IES) has set a number of guidelines the you may wish come consult.

The following is an infographic that sets out a number of guidelines to identify the amount of lumens you should light the various rooms of your house:


Do not hesitate to contact one of our lighting experts. This evaluation service on industrial or commercial applications is cost-free of charge.

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