To sum up: In the calculation 100% of the light emitted from the LED is directed perfectly into an angled beam which illuminates an area 100% evenly. This would also not be true in most cases, since a LED never distributes the light evenly. This extra loss is not reflected in the calculator.Īnother assumption we have made is that the light is evenly distributed over the illuminated area. When using the focussing to create a spot beam there will be a higher loss of light than when using the wide beam. Some flashlights and headlamps have a focussing system, meaning that the light can be directed from a wide beam into a spot beam. No matter the manufacturer there will always be some loss of light because of the optics. No flashlight/headlamp optics are efficient enough to direct 100% of the light emitted from the LED into a perfect angled beam. In the calculation loss of light from the optics have not been taken into account. Therefore we have had to make some assumptions in order to make this calculator. If you do not already use a flashlight or headlamp but you know how you would be using it, you can use the calculator to specify how many lumens you would need to obtain a certain lux level.įlashlights and headlamps from different brands are constructed very differently which reflects in how efficiently they perform. If you already use a flashlight or headlamp you can type in the specifications to see how many lux it provides at different distances. How do you pick the right lamp for the job? But how much is 200 lux, and is it enough light for you? For comparison a office desk is required to have 500 lux. The EN 12464-2 (outdoor section) states that an outdoor construction site must have 20 lux worth of light for jobs like “clearance, excavating and loading” but 200 lux for jobs like “Element jointing, demanding electrical, machine and pipe mountings”. As an example outdoor construction sites are required to have 20-200 lux depending on the job. The European standard EN 12464-2 states how many lux that are required for different indoor and outdoor jobs. How many lux you need depends on the job situation, but also on safety measures. How many lux do you need? What is required and what is enough In reality lux can be used to specify how much light is required on a construction site or in an office, to be able to work safely and efficiently. When using the 70° flood beam all the lumen from the Q7xrs is spread out over a larger area, and when using the 15° spot beam all the lumen is focused into a very small area. If you use a Suprabeam Q7xrs with 2000 lumen to light up a wall 2 meters away, there will be 440 lux on the wall if you use the wide 70° flood beam, but 9301 lux if you use the Hyperfocus to focus the beam into a 15° spot beam.
A flashlight or headlamp cannot be marketed with a specific amount of lux, because it depends on how far away the light source is and the angle of the light beam.
Lux is used to determine the intensity of the light over an illuminated area, to be specific 1 lux equals 1 lumen pr. Lux (lx) is also a unit used to measure light but unlike lumen, lux takes area into account. And this is where lux comes into the picture. This is why the number of lumen not necessarily corresponds to how bright the light appears in reality. Lumen is measured in a closed sphere that captures all the light emitted from the light source, but it does not take the optics into account. Lumen (lm) is the total amount of light emitted from a flashlight or headlamp, so the more lumen a light has the brighter it is – roughly. Lumen to lux What is lumen and lux? And how can the units be used to find the right light for the job.
0 kommentar(er)
