LED Lighting – Effective Soffit Lighting

Efficiency, Output, and Costs in Outdoor LED Lighting

When installing a soffit light, or any outdoor lighting, the essential choice of what to use, is a tradeoff of efficiency, output and costs.

A new Department of Energy (DOE) Lighting Fact Sheet, states that there has been a threefold improvement in efficiency in LED lighting since 2005 for LED fixtures and lamps. Many LED fixtures now have efficiencies that are higher than traditional High Intensity Discharge (HID) lamp based fixtures, most frequently used in outdoor lighting.

HID Outdoor Lighting Efficiency

Outdoor lighting is more than just the efficiency of a HID soffit light versus a LED fixture. The critical factor as outlined in the DOE Lighting Fact Sheet is the ‘application efficiency’ of the LED fixtures.

In short, lighting application efficiency is about how many watts it takes to meet standards for a specific outdoor lighting task, such lighting a canopy area,  a series of storefront, along a sidewalk, or over an entryway.  In applying the application efficiency concept to an HID lamp, the output of the metal halide lamp is not the most important factor, but how much light is delivered to the task. All HID lamps in an outdoor lighting fixture suffer substantial losses. As the omni-directional lamp’s light is bounced and focused to the task, it loses light, thus reducing efficiency.

Soffit Lighting – Efficiency Gains from Directional Light of LED Fixtures

LED lighting, especially the LED Soffit Light from IntenCity Lighting, do not suffer this form of fixture loss. This LED lighting is inherently directional, and uses a focused source and optics to direct light onto the ground where it can be most effectively used. Adding remote phosphors to the soffit lighting system, results in increase efficiency delivering 120 lumens/ watt to the LED lighting task.  As detailed in the figure from the DOE Lighting Facts sheet, the LED Soffit Light from IntenCity Lighting, exceeds the delivered light efficiency of best-in-class metal halide fixtures or HPS fixtures, and exceeds many of the best LED lighting fixtures on the market. Further the soffit lighting, because of the way the remote phosphor is used, results in less glare, and very high CRI values for high quality illumination.

LED Soffit Lighting Efficiency compared to HID Soffit Efficiency

LED Soffit Lighting v. a HID Soffit Light Efficiency

In comparing this LED soffit light, with other LED Lamps and LED Fixtures, it has an efficiency that exceeds the 7,000 lighting sources as documented in the DOE fact sheet.  When graphing the HID soffit light efficiency to the soffit lighting fixtures efficiency, it becomes readily apparent how the outdoor lighting effectiveness doubles. When considering the cost to power a HID soffit light v. an LED soffit light, the economics become even more compelling. The 100 watt HID soffit light, costs $177 per 10,000 hours, while the 25 watt LED soffit light costs $37.50 at $0.15 per kilowatt hour. The LED soffit lighting is cost comparable to HID soffit fixture. Its light output is equivalent, yet its electric costs are 79% less.

LED Soffit Lighting Efficiency v. Lighting Output Compared to 7,000 Lighting Fact LED Lamps and Fixtures

Across the factors of efficiency, output and costs, the LED soffit light is the compelling choice to achieve effective outdoor lighting for any number of illuminations tasks around storefront  in canopies, entryway  or perimeter lighting instead of using traditional and outdated HID soffit Light.

Energy Efficiency of LEDs – Solid-State Lighting Technology Fact Sheet (PDF)

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