LED bulbs and their efficiency in lumen and luxĪs the table above shows, LED lights are the most efficient in terms of power consumption (W) and light flux power (lm). Lux takes into account the light on the surface to be illuminated: a specific light flux on one square metre is not the same as one distributed over ten square metres.Īnd although these two units of measurement are related, since the lux is simply the lumen divided by the square metre, they are different and measure two distinct aspects that are equally important. Conversely, if the angle is very open, the power of the flux is dispersed. This is the case with table lamps, which direct all their power onto a specific place. If the angle is very close, the flux will largely be concentrated in a small space. Lumen helps us to understand how luminous flux works depending on the angle at which light is projected. What is the difference between lumen and lux? Accordingly, it is important to follow the instructions provided by the company to adapt our remote working space. A light meter is the device used by professionals to measure illuminance and determine whether our workplace meets the legal requirement. General space (living room, office or bedroom): 100-200 luxĬurrent employment legislation stipulates a minimum lux level for a professional working environment to safeguard our health. Reading/work area (living room, office or bedroom): 500 lux This is why there are general recommendations adapted for each type of surface: This operation is done to determine how much light is being covered within a room if we fall short, there is a risk that only a certain part of the room will be illuminated. This is much simpler: once we know the lumen of a light, we divide the result per square metre. This enables us to determine the efficiency of the bulb, since the ideal is to use the least number of watts to generate the most lumens.įrom the lumen (lm) it is possible to determine the lux, which is simply the unit of measurement used to establish the level of illumination. Under European Union (EU) requirements the power in lumens must always be indicated, along with the power consumption in watts. Therefore, the lumen represents the unit of measurement for the luminous power emitted by a light source, thus expressing the power of a specific light. In simpler terms, we could say that to determine the lumen, the intensity is multiplied by the solid angle that it covers. It is established from two different variables: the candela (represented by the letters cd) which measures luminous intensity, multiplied by the steradian (represented by the letters rd), which represents a solid angle unit. The lumen is part of the International System of Units and is represented by the letters lm. Because the intensity of light required for the kitchen or in a reading corner is not the same as the quality that our office light must provide compared with our bedroom light.īut how is the luminous flux of a light source measured? With the measurement known as a lumen. Both concepts are very necessary for a good understanding of the characteristics that will help us reach the best decision. To learn more about how and for what purposes Amazon uses personal information (such as Amazon Store order history), please visit our Privacy Notice.In order to select the best option for your lighting, it is essential to assess the quality of light intensity. You can change your choices at any time by visiting Cookie Preferences, as described in the Cookie Notice. Click ‘Customise Cookies’ to decline these cookies, make more detailed choices, or learn more. Third parties use cookies for their purposes of displaying and measuring personalised ads, generating audience insights, and developing and improving products. This includes using first- and third-party cookies, which store or access standard device information such as a unique identifier. If you agree, we’ll also use cookies to complement your shopping experience across the Amazon stores as described in our Cookie Notice. We also use these cookies to understand how customers use our services (for example, by measuring site visits) so we can make improvements. We use cookies and similar tools that are necessary to enable you to make purchases, to enhance your shopping experiences and to provide our services, as detailed in our Cookie Notice.
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