LED High-Bay Lighting Fixture with Built-In Daylight Dimming
High-Bay Lighting: LED Fixture w/Integrated Daylight Dimming vs. LED Fixture w/o Daylight Dimming
An LED lighting fixture intended for commercial and industrial high-bay lighting with a built-in daylight sensor that dims light output to save 20 to 50% of the energy of full light output.
Item ID: 390
Typically, HID and fluorescent light sources are used in conventional high-bay lighting applications. High-bay luminaires using LED light sources are becoming more widely available, providing equivalent lighting with significantly reduced energy consumption. Including automatic dimming control based on ambient light levels can provide even greater energy savings. With fixture-by-fixture monitoring of ambient light levels, energy savings can be maximized by ensuring that no area is over-lit.
High-bay luminaires employing LED technology are widely available from a number of manufacturers, and automatic controls are becoming more prevalent. The U.S. Department of Energy (DOE) is encouraging research, development and market penetration of the technology and is providing resources for objective, ongoing information about the technology. The Design Lights Consortium includes a category for LED high-bay and low-bay lighting and as of December 2011 there are over 200 products qualified.
LEDs are particularly well suited to operate with automatic controls such as photosensors and occupancy sensors, allowing light output and power consumption to be reduced based on the availability of ambient lighting and during periods of low occupancy. Lamp life could be significantly longer than other systems in use, making it especially good in hard-to-access locations. Additionally, DOE predicts continued improvement in efficacy and decline in price for LED lighting.
Baseline Description: LED Replacement for 400W HID high-bay lamp
Baseline Energy Use: 524 kWh per year per unit
This baseline analysis assumes that daylighting controls are added to a 120W LED lamp that replaces a MH lamp that originally required 458 input watts (including standard magnetic ballast losses) operating for twelve hours per day, seven days a week, for 52 weeks per year. This technology increases the savings already provided through installation of the LED lamp (see Technology #413). Note: According to Table 4.7 in the "2010 U.S. Lighting Market Characterization" report, average daily operating hours for Metal Halide lamps in the commercial sector is 11.1 while the number increases to 16.5 hours in the industrial sector. The weighted average is about 12.3 hours of daily operation for all commercial and industrial sector Metal Halide lamps (also see Table 4.1 for the numbers of lamps in the commercial and industrial sectors). Use 12 hours per day for determination of baseline lamp annual operating hours and energy use.
Manufacturer's Energy Savings Claims:
Currently no data available.
Best Estimate of Energy Savings:
"Typical" Savings: 10%
Energy Savings Reliability: 3 - Limited Assessment
It is likely that the daylighting feature of this LED lamp ET will have limited usefulness except in specific applications i.e. warehouses with side windows or gymnasiums or production areas with skylights, but this ET implies changing from HID or another light source (such as T5HO or T8HP high bay lamps) to LED, and this will save substantial energy even without additional controls. An alternative energy savings measure is to include occupancy sensors with the LED retrofit. Assume that the addition of daylight dimming controls reduces the LED lamp energy consumption by 10%.
Energy Use of Emerging Technology:
471.6 kWh per unit per year
Energy Use of an Emerging Technology is based upon the following algorithm.
Baseline Energy Use - (Baseline Energy Use * Best Estimate of Energy Savings (either Typical savings OR the high range of savings.))
Potential number of units replaced by this technology:
Indoor HID lamps. 2010 U.S. Lighting Market Characterization, Navigant for U.S. DOE, 2012, Table 4-1: “Estimated Inventory of Lamps in the U.S. by End-Use Sector in 2010”. The number of Metal Halide lamps in the commercial and industrial sectors (nationwide) is estimated at 39,829,000 lamps. Four percent of this total (prorating by population of the Northwest) yields a total of 1,593,160 lamps. Use 1,500,000 due to uncertainty.
Regional Technical Potential:
0.08 TWh per year
Regional Technical Potential of an Emerging Technology is calculated as follows:
Baseline Energy Use * Estimate of Energy Savings (either Typical savings OR the high range of savings) * Technical Potential (potential number of units replaced by the Emerging Technology)
Currently no data available.
Simple payback, new construction (years): N/A
Simple payback, retrofit (years): N/A
Cost Effectiveness is calculated using baseline energy use, best estimate of typical energy savings, and first cost. It does not account for factors such as impacts on O&M costs (which could be significant if product life is greatly extended) or savings of non-electric fuels such as natural gas. Actual overall cost effectiveness could be significantly different based on these other factors.