Landing light B would allow the pilot to see further down the runway and possibly avoid a deer strike. If these lights were on airplanes landing on parallel runways at night at the same time and position in glide slope, landing light B would be able to light up the runway well before landing light A.
Landing light B has a high lux measurement. For example, landing light A has a low lux measurement. Lux factors in the assembly’s efficiency at distributing light to a specified area–in this case, the runway. A landing light might have an insanely high Lumen count, but that doesn’t mean it will have high Lux levels. The Lumen measurement does not change, of course. As you descend and get closer to the runway, the runway gets brighter, and your landing light’s lux reading increases. Imagine your final approach to the runway at night. By definition, Lux is “a unit of illumination equal to the direct illumination on a surface that is everywhere one meter from a uniform point source of one candle intensity or equal to one lumen per square meter.” The closer the surface to the light source, the higher the lux reading.
Lux tells us how much light actually falls on a surface from a given distance. This issue is why we prefer to highlight (no pun intended) Lux and Candela. As a result, Lumens do not tell you the actual, real-world effective output of the light assembly–especially when factoring in the assembly’s electrical efficiency, lens clarity, distance from the runway, presence or absence of daylight, and so on. Lumens refer to the potential amount of light emitted from the source area in an ideal world, based on each individual LED chip's rating multiplied by the total number of LED chips in the light assembly. The issue with selecting an LED based only on its Lumen count is that the measurement only paints a theoretical picture of the LED’s performance. Lumens are “a unit of luminous flux equal to the light emitted in a unit solid angle by a uniform point source of one candle intensity.” Lumens tell us how much light a light source should emit in the immediate area around it. To get an idea of what a candela is without getting all kinds of involved with the science of light let’s look at a candle.LIGHTS WITH THE MOST LUMENS ARE THE BEST, RIGHT? This means that we can build other units measurement off of this unit of measurement. Lumens and candela are indeed related, but caution should be used when evaluating using both numbers.Ĭandela is an SI (Système Internationale, translated: International System or as we know it, Metric System) unit. I’ll let you in on a secret (that’s not very secret). Now you’re lost and cringing as you think back to your recent dealings with the darkness. When you get online you see all kinds of numbers that sound like they just might back such claims as “world’s brightest flashlight.” You see numbers like 1,300 lumens (lm) and 102,000 candela (cd) but have no idea how those numbers relate or if they can even be compared. You want to be able to melt the space station should the need arise. You will invest in a dedicated flashlight. Never again, never again will you make such a grave mistake. It is at this moment, as you sit on your throne in absolute darkness, contemplating how you’re even going to know whether your done wiping that you make a decision. That little LED was holding your world together, keeping the soul-crushing darkness from reaching you, and also sucking down those last few milliamp hours your battery had left to give. In this particular instance, it’s on a toilet in the middle of a blackout with a dead phone, because while level 437 may have been moments away from conquering, the tiny LED in the back of your phone was doing what was asked of it. The kind of soul-crushing blackness that can make a person rethink who they are, and how they ended up where they did in life. Well, it was already dark, but now it’s nothing but blackness. Now that you’ve made it to the bathroom (good deal), and you’re taking care of business, everything goes dark. You know that the next round of Candy Crush Saga can’t wait but yet you need the light to find the bathroom. It’s your battery percentage and it’s at 7%. Tiny at first, but now that you’ve noticed it, it’s tugging at you, nagging to be noticed again and ever-growing in the forefront of your consciousness. Ah, the wonders of modern technology!īut then you see it. The power goes out and you grab your phone and flip open the flashlight mode.
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