26 the ELEC TRICAL DISTRIBUTOR • May 17
evaluated a variety of luminaires and found that a direct-indirect optic pro- vides the best ratio. Other solutions include luminous workstation panels and task lighting that offer vertical brightness. • Light level and spectrum work together. Lower light levels generally produce lower CS values unless com- pensated by an SPD that delivers more power at shorter wavelengths (cooler light source). Figueiro pointed out hat when designing for an average workplane light level of 30 footcan- dles (fc), the researchers found that a 6000K source was needed to achieve the target CS threshold of . 3. A 4500K source was needed for a workplane light level of 40fc. Figueiro advised that the design should also consider light exposure all day, who will be using the space, and layering the light to deliver light- ing that is both functional and capable of circadian stimulation. To use the CS calcu- lator, designers should formulate a base condi- tion by evaluating the space using the calculator and software such as AGi32. The design can later be fine-tuned again by using the CS calcula- tor, while also accommo- dating IES recommenda- tions, energy codes, and owner requirements. The development of the CLA and CS metrics and calculator is poten- tially exciting for the lighting industry. With metrics and tools based on scientific research, the industry can begin devel- oping and vetting practi- cal design concepts aimed at stimulating a circadian response. Download the free CS calculator at LRC.RPI. edu/programs/light Health/ index.asp. ;
DiLouie, LC, principal of
Zing Communications (zing
inc.com), is a lighting industry journalist, analyst,
and author. Reach him at
LIGHTING REBATES GOING STRONG
In 2016, lighting rebates covered 79% of the United States, according
to BriteSwitch. In 2017, LED rebates are expanding, while rebate per
product is falling and control rebates remain relatively constant.
Many utilities offer rebates to customers as an incentive to use
less energy. These rebates can significantly reduce the cost of new
lighting, improving payback by an average 20% to 25%.
In 2016, many programs began to focus heavily on LED products,
with some today now exclusively promoting LED. The top LED rebates are replacement lamps, downlights, accent lights (trackheads),
and high-bays. New rebates are emerging to cover LED wall-mount
and mogul-base (HID replacement) lamps. Reflecting falling LED product costs, the average
rebate per LED product has been falling by 10% to 20% per year, according to BriteSwitch; additionally, some programs may cap LED rebates based on end-user cost or payback periods.
Many programs qualify LED products based on criteria developed by the DesignLights Con-
sortium (DLC), Energy Star, and Consortium for Energy Efficiency. About 94% of rebate pro-
grams for LED screw-in replacement lamps use Energy Star, while 60% to 80% require DLC,
depending on the product type.
In contrast, lighting control rebates remain relatively constant, with average rebates often
covering a significant portion of the installed cost. The most popular control rebates cover occu-
pancy sensors, light sensors, and daylight dimming systems.
Control products typically do not have to meet stringent third-party criteria, although some
criteria may be imposed, such as hardwiring, minimum wattage controlled per control point,
and/or UL listing. Many utilities are adjusting the minimum wattage down in recognition of LED
lighting’s reduced wattage; some are eliminating the hardwiring requirement, allowing wireless
controls. According to BriteSwitch President Leendert Jan Enthoven, some utilities are experimenting with midstream rebate programs to reduce cost and expand reach. These programs
require customers to buy lighting through specific program partners to get the rebate, which is
then taken off the invoice from a participating distributor.
“For distributors and contractors, these midstream programs bring new levels of complexity,
since they are now responsible for the rebate process instead of the end-user,” Enthoven said.
“They need to make sure they get the correct utility bills, tax IDs, and location information and
10% of programs run out of money during the year. According to BriteSwitch, pre-approval is
submit it to the utility in a timely fashion. They also have to take the rebate off the invoice, which
is risky in case the customer does not install the product in time or in a different location, and it
is noticed during postinspection. The distributor is on the line here.”
To support a customer seeking a rebate, get to know the local program early, including its
incentives, qualifications, deadlines, and process. Also, stay on top of current funding, as about
required by about 80% of rebate programs, a process that takes 29 days on average. It can take
10 to 12 weeks to receive the rebate check after installation. If the utility maintains a network of
trade allies (qualified service providers), consider participating in that network.
Learn more about rebates by visiting dsireusa.org. —C.D.