Jan 18, 2017: The US Department of Energy (DOE) has issued a Caliper Snapshot report on LED-based troffer luminaires, which have started penetrating the commercial office and industrial market. Usually the 2×4-, 2×2-, and 1×4-ft troffer LED fixtures are being used in commercial space.
The DOE report called “Caliper Snapshot Troffers” states that troffers are traditionally fitted with linear fluorescent lamps, which are efficacious, and set a high bar for LED products in this category. LED troffer products made a late entrance to the LED Lighting Facts database of DOE. In 2013, troffers represented a part of the products listed in the DOE Lighting Facts program, which is now representing 20% of the listed luminaire products and retrofit kits. These products are more energy-efficient, and offer better color and power quality compared to fluorescent-based troffers.
The Caliper Snapshot Troffers report includes data for both troffer luminaires and troffer retrofit kits. The report states that if the troffer retrofit kits does not reuse the existing luminaire’s optical system (lens), it will affect the performance of the complete system. A product using the existing luminaire’s optical system will have a lower efficacy.
The Caliper Snapshot Troffers report is compiled based on data in the Lighting Facts program. LED troffers and retrofit kits offer better efficacy over the fluorescent lambs. The report reveals mean efficacy for the LED troffers at 102 lm/W and troffer retrofit kits even higher at 112 lm/W. However, DOE said 10% of the listed products achieve efficacy of 125 lm/W or better.
According to the report, both troffer luminaires and troffer retrofit kits have even distribution of products among nominal CCTs of 3000 K, 3500 K, 4000 K, and 5000 or 6500 K. It says that 4500 K is not a standard offering for fluorescent lamps, which explains the similar lack of LED products at that CCT.
All the listed troffer retrofit kits and 89% of the troffer luminaires have a CRI Ra in the 80s. While average color fidelity (e.g., CIE Ra) is not a good measure of color quality, this homogeneous performance leaves little choice for specifiers. Not enough IES TM-30-15 data (which is optional) have been submitted to LED Lighting Facts to allow for meaningful comparisons.
The DOE issues Caliper Snapshot reports on a frequent basis across many application types.