This type of exterior lighting is generally used to provide illumination to areas for vehicles and pedestrians use, as well as for security purposes. It is not uncommon to see multiple fixtures mounted on a single building or wall, with the fixture spacing designed to provide lighting at the ground level around the exterior of a building.
All HID lamps have some inherent characteristics that can lead to issues for those managing industrial lighting fixtures, commercial lighting fixtures, retail lighting fixtures, and school lighting fixtures.
Industrial LED Lighting, Commercial LED Lighting, LED Retail Lighting, or any other applications using LED Wallpack Lighting can realize significant benefits because of how they GENERATE light and how they DISTRIBUTE light. Light Emitting Diodes generate light via a semi-conductor, as opposed to the consumption of a “fuel source” like in HID lamps. In regards to “distributing” light, LED fixtures commonly utilize “Multi-Point” sources, meaning the light fixtures have Multiple Diodes with individual optics. When you compare this to the way most HID fixtures distribute light (with a single bulb and reflectors within the fixture), the result is light that is more EVENLY “distributed’ across a surface.
Common wattages for LED wall pack fixtures can range from 24 Watts to 82 Watts, often resulting in a 40%-60% reduction in energy consumption. The reason for this can be referenced to the “GENERATION” comments above, and can result in savings of up $300 per fixture per year in electricity costs.
Again, due to the way LEDs generate light, the way they progress through their functional life is much different. Instead of ceasing to function properly once a fuel source is significantly reduced, LED generated light output degrades VERY SLOWLY over time. As a result the functional life (often in excess of 100,000 hours) of an LED product can be significantly longer than that of an HID Lamp. For example, by converting conventional 250w HID Wall Pack to a LED wall pack, a typical facility with exterior building lights can save up to $5,341 over the course of 3 years maintenance costs alone.
Moving on to the way LED fixtures “DISTRIBUTE” light. As a result of the Multi-Point design, LED Wall Pack Lighting applications often provide very EVENLY distributed light. What this means is that light levels across a given surface will vary less between fixture mounting locations. Compared to HID fixtures, which often product a “bright spot” directly underneath the fixture with light levels decreasing drastically as the distance between fixtures increases. The result, in regards to LED vs HID, is a more even foot candle distribution from the LED conversion. In addition to the even distribution of light, LEDs are available in a range of CCT’s, and as a result provide a range of options to increase the visual perception of “brightness”.
Depending on the type of HID Lamp your facility utilizes, the performance characteristics of your wallpack lighting can vary significantly. For example, if you are using Metal Halide lamps you may see light that is “whiter'', but these types of lamps tend to have accelerated lumen degradation, meaning the light output of the lamps decrease quickly after initial install, and as a result the overall lifetime of the lamp decreases (we have all seen those building Light fixtures that have “pink” lamps that are barely providing any lighting on the ground). If you are using High Pressure Sodium you may see longer “useful” life as these lamps see less lumen degradation then Metal Halide, but their fuel structure produces a very “Orange” light with a very low CRI (Color Rendering Index). So basically you trade a longer life for a poorer quality light, in regards to visual perspective.