Jeffries electric is a GSA schedule holder. The info provided is from the public domain. Jeffries electric has great residential electric repairs and commercial electric repairs. We install 200 amp panels and replace federal breaker panels. We install landscape lights and recessed lights. We fix electrical plugs and electrical switches and 3 way switches. we are your Denton electrician, Coppell electrician, lewisville electrician, highland village electrician, Frisco electrician, Plano electrician, corinth electrician. We fix gfci plugs and repair breakers. We install whole house surge protector. Licensed electrician and insured electrician. Add phone outlets. We repair landscape lights. We fix light switches. Install ground rod. Electric repair work should be performed by a licensed electrician. Be safe and turn off the breaker first.LED lighting is great for outdoor lighting and landscape lighting. Save energy by conserve energy. Long lasting bulbs and white light are LED lamps.
Kitchen Undercabinet Lighting
Undercabinet lighting is potentially a good application for LEDs, taking advantage of their directionality and small size. This section looks at undercabinet specifically for residential kitchens, and presents information on the performance of several LED fixtures suited for this application.
Overview of Kitchen Undercabinet Lighting
Undercabinet lighting is used in kitchens to provide task lighting and to supplement the overall ambient lighting for the space. Undercabinet lights illuminate the horizontal task surface used for food preparation, reading cookbooks and food packages, cooking, and clean-up, and provide vertical illuminance on the wall behind the counter. Color temperature for residential kitchens is typically 3000K or lower, providing a warm look. Color rendering is important for evaluation of the appearance of food, for social interaction, and for complementing decorative finishes used in kitchens. The task plane is typically 20 to 22 inches in depth and the length varies in relationship to the upper and lower cabinets. Uniform illumination is important to prevent shadows and give the perception of a larger space.
Typical fixtures designed for use with halogen or fluorescent sources range from about 30% to 50% efficient, which means that half or more of the light produced by the lamps never leaves the fixture. The inherent directionality of LEDs can provide a distinct advantage, allowing them to compete with traditional light sources in this application. The table below presents energy and light output data for several traditional fixtures, two currently available LED-based undercabinet fixtures and one LED-based prototype. The LED fixtures tested are all more efficacious than halogen, and two of the three are approximately the same or more efficacious than the fluorescent fixture, on a luminaire basis.
Terms
Luminaire:
A complete lighting unit including lamp(s), ballast(s) (when applicable), and the parts designed to distribute the light, position and protect the lamps, and connect to the power supply.
Luminaire (fixture) efficiency:
The ratio of luminous flux (lumens) emitted by a luminaire to that emitted by the lamp or lamps used therein; expressed as a percentage.
Luminaire efficacy:
Total light output (lm) provided by the luminaire divided by the total wattage (W) drawn by the fixture, expressed in lumens per watt (lm/W).
Directionality:
Luminaires designed to take advantage of LED directionality can be more energy efficient than those using traditional light sources. For example, most incandescent and fluorescent lamps emit light in all directions. In typical undercabinet fixtures, only about half the light produced by the lamp actually comes out of the fixture. LED undercabinet luminaires can be designed to direct light to the horizontal countertop and vertical backsplash surfaces, using less total energy than other sources.
CCT:
Correlated color temperature indicates the relative color appearance of a white light source, from yellowish-white or “warm” (2700-3000 K) to bluish-white or “cool” (5000 K).
CRI:
Color rendering index is a measure of the ability of a light source to render colors accurately, on a scale of 0 to 100, with 100 being best.
Potential for Use of LEDs in Kitchen Undercabinet Lighting
LEDs are a natural fit for undercabinet lighting. The ability to string LEDs in a linear array or to cluster them in a puck-like fashion provides options to lighting designers to imitate the form factor of linear fluorescent lamps or the single lamps of a halogen or xenon fixture. The efficacy of newer high-flux LEDs is approaching that of fluorescent lamps with a wider choice of color temperatures available. The inherent directionality of LEDs allows a larger proportion of the available light to be directed where it is needed and not lost within the fixture.
Typical fixtures designed for use with halogen or fluorescent sources range from about 30% to 50% efficient, which means that half or more of the light produced by the lamps never leaves the fixture.
Luminaires for undercabinet applications are usually linear in design although “puck” style products are available as well. Luminaires were compared on a per-linear foot basis as products are sold in varying lengths with varying light outputs. Compared to the traditional fixtures, the LED fixtures provided equivalent or more lumens per linear foot. One of the LED fixtures produced more than two times the lumens per linear foot than the traditional fixtures. The bottom line of the table shows LED luminaire efficacy similar or better than the high performing fluorescent fixture. The three LED fixtures all have similar CCTs to both the halogen and the fluorescent fixtures although their CRIs are lower. One important caveat: lumen depreciation
Outdoor area lighting appears to be a promising application for LED technology. New products are being introduced regularly. As with all LED products, careful information gathering and research is needed to assess quality, performance, and overall value.
LEDs intended for lighting do not emit infrared or ultraviolet radiation.
What makes LEDs different from other light sources?
LEDs are semiconductor devices, while incandescent, fluorescent, and high-intensity discharge (HID) lamps are all based on glass enclosures containing a filament or electrodes, with fill gases and coatings of various types.
LED lighting starts with a tiny chip (most commonly about 1 mm2) comprising layers of semi-conducting material. LED packages may contain just one chip or multiple chips, mounted on heat-conducting material and usually enclosed in a lens or encapsulant. The resulting device, typically around 7 to 9 mm on a side, can produce 30 to 150 lumens each, and can be used separately or in arrays. LED devices are mounted on a circuit board and attached to a lighting fixture, architectural structure, or even a “light bulb” package.
General illumination applications that may most benefit from the LED attributes described in this section including the following:
- Undercabinet lighting
- In-cabinet accent lighting
- Adjustable task lighting
- Refrigerated case lighting
- Outdoor area lighting
- Elevator lighting
- Recessed downlights
- Accent lights
- Step and path lighting
- Cove lighting
- Spaces with occupancy sensors
- Food preparation areas
- Retail display cases
- Art display lighting
Jeffries electric has great residential electric repairs and commercial electric repairs. We install 200 amp panels and replace federal breaker panels. We install landscape lights and recessed lights. We fix electrical plugs and electrical switches and 3 way switches. we are your Denton electrician, Coppell electrician, lewisville electrician, highland village electrician, Frisco electrician, Plano electrician, corinth electrician. We fix gfci plugs and repair breakers. We install whole house surge protector. Licensed electrician and insured electrician. Add phone outlets. We repair landscape lights. We fix light switches. Install ground rod. Electric repair work should be performed by a licensed electrician. Be safe and turn off the breaker first. As a GSA schedule holder, we can help you meet your energy budget.
