#LUMEN BRIGHTNESS SCALE UPGRADE#
Suppose you want to upgrade that same parking lot light fixture to LED. The intensely powerful and energy-consuming HID lamp is needed in this case so that enough of its light makes it down to the ground. With traditional lighting, a good percentage of light is lost before it hits the ground, often escaping into the fixture housing or diffusing as it bounces around the housing’s reflectors. But you don’t need the light in all directions you only need the light down on the surface of the ground. That 250-watt bulb outputs roughly 14,000 lumens (on average) in all directions. For example, suppose you have a parking lot light that uses a 250-watt metal halide HID lamp. This is increasing common in commercial and industrial applications. It is worth noting that as you scale up and start getting into larger bulbs and light fixtures with more intense light output, additional factors come into play when comparing different lighting technologies and you need to look beyond simply the lumen output.ĭirectionality is one such factor. The efficiency at which an LED converts the energy it is consuming into visible light (its efficacy) is improving all the time, so its wattage usage will continue to go down and down for the same amount of light output. This is just a general guide only, and limited to general purpose, household omnidirectional bulbs and their common brightness levels. So how do these all stack up? How many lumens did a traditional incandescent 60-watt light bulb give off? What’s the modern LED equivalent? And with LED technology constantly evolving and becoming more efficient, it is becoming more and more important that we become comfortable with lumens. But new LED technology is changing all that requiring far less energy to give off the same amount of light. Older incandescent bulbs converted their used energy into visible light at a predictable rate (albeit terrible), so we were very familiar with it. The lumen output is what determines brightness and is the term and measurement we should all start to get very familiar with. How bright is that light bulb or fixture? How much light is it giving off? The unit of measurement to determine how much light a lamp or luminaire emits is called lumens. What we’re after here is brightness the amount of light emitted by a light source. Rather, they are a measure of how much energy a light source is consuming. But watts are not a measure of light output. A 60-watt bulb meant you got 60 watts of light. It has become common and ingrained in our minds to think of how bright a light bulb or light fixture is based on its wattage. But there’s a problem with it: It makes no sense at all. We’ve all been part of a similar conversation before. “How bright of a bulb do you need in that light fixture?”
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#LUMEN BRIGHTNESS SCALE HOW TO#
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