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Lighting Terms and Definitions To help Choose the Best Lighting Solution

Commercial and architectural lighting is a spectacular combination of design, science, and innovative technology. Using photometry, the science of the measurement of light in terms of perceived brightness, manufacturers can precisely explain to customers how their commercial or architectural lighting will perform.  However, anyone purchasing commercial lighting or architectural fixtures must understand some extremely important terms, definitions and be able to decipher specific diagrams.

Reading Photometrics and Specs in LED lighting

Ambient Lighting Lighting throughout an area that provides general illuminations.

Ballast – A device used with an electric-discharge lamp to obtain the necessary circuit conditions (wave form, voltage and current) for starting and operating.

Batwing Distribution A symmetrical light distribution producing light angles to the right and left of the observer with comparatively little direct downward illumination as in the shape of a bat wing.

Beam Spread: 50% maximum candlepower.

Candela (cd): This is the term used to compare Luminous intensity. Candela is the unit of measure indicating the luminous intensity (candlepower) of a light source in a specific direction


Candelas/meter² (cd/m²): The quality of light that leaves a surface. This is measurement is what the eye can perceive which will offer more information about the quality and comfort of a design rather than its illuminance alone.


Center Beam Candle Power (CBCP): CBCP is the max candlepower a lamp can achieve at nadir (angle between the vertical axis).


Color Temperature (chromaticity) The degree of warmth or coolness of a light source, measured in degrees Kelvin (K).  The higher the degree K, the more blue, or cooler the lamp appears.  The lower the degree K, the more red or warmer the lamp appears.

Cutoff: Angle between the vertical axis (nadir) and the line of sight when the brightness of the source or its reflected image is no longer visible.

DLC The DesignLights Consortium (DLC) promotes quality and energy efficient lighting for the commercial sector. When you buy a product that’s on DLC’s Qualified Products List (QPL), you’ve got yourself a superior lighting product.

Efficiency: The comparison between how much light is emitted from a luminaire.

Efficiency% = Luminaire Lumens / Lamp Lumens


Footcandles (fv): The measure of the quality of light that arrives on a surface. Luminaire intensity, direction of the surface, the distance from the luminaire to the surface and the angle of incidence of the arriving light are all factors that affect illuminance. Undetectable to the human eye, this information is commonly included and used in specifying designs.


Lamp Information: Term used to identify the lamp designation and its initial lumen output.

Lumens (lm): Luminous flux is measured in lumens (lm) which is the total amount of light produced by a source without taking direction into consideration.


Luminaire Spacing: Luminaire Spacing = SC x Height to Illuminated Plane

Luminance: Indicator of the brightness of an aperture. Spec sheets will sometimes include various viewing directions, the 0 direction being the direction where the light is aimed. Luminance is a primary indicator of the quality and comfort of a lighting system.


Spacing Criterion (SC): A mathematical calculation of the maximum spacing allowed in order to achieve reasonably even illumination.

Test Number: Used to identify the specific lamp and luminaire combination being tested.


Unit LPW: Indicator of the total system efficiency.

LPW = Lamp Lumens x Luminaire Efficiency / Luminaire Watts


When looking over any manufacturer’s spec sheets, charts and graphics will play a vital role in describing fixture properties. From Candela diagrams to Downlight and Accent charts, find explanations of each in this list. The example spec sheet for the Lumenera V2 will give anyone a better idea of how all these terms and diagrams come into play.

Accent: This graphic shows patterns of light from adjustable accent luminaires dependent on lamp type, wattage, lamp tilt and location of illuminated plane.


Beam Aiming: Diagrams allowing a designer to easily choose the right distance from a wall to locate a luminaire and find the center beam of the lamp where desired


Candelas: Diagrams that will graphically illustrate the light intensity at specific directions from nadir..

Cone of Light: Used for rapid lighting comparisons and calculations – cone of light is used to calculate initial footcandle levels for a single unit based on point calculation techniques.


Downlight: These charts show single-unit performance without considering inter-reflections from surfaces.

Wall Wash Data: There are two different kind of Wall Wash Data charts.

  1. Single-unique performance chart that plots the illuminance levels at one-foot increments along and down a wall.
  2. Multiple unit performance charts show the performance of the middle units computed from a four unit layout.


Outfitting a building with lighting is a crucial step in upgrading any industrial facility or architectural project. Understanding the terminology that goes along with choosing fixtures is essential. Keeping this handy resource close by will make any purchasers life just a little bit easier.

At RLE Industries you will find a wide range of lighting fixtures for nearly any commercial or architectural lighting application imaginable. Click here to start browsing the variety of products or, call a trusted and experienced lighting professional at (888) 318-0500 for any additional questions about upgrading commercial or architectural lighting fixtures.


What Does DLC Approved Mean? Why Does DLC Certification Matter?

DesignLight Consortium®

Energy Efficiency and Performance Standards

Searching for commercial lighting solutions can be challenging. Industry terms, certifications, and countless fixture options can make upgrading the lighting in any facility feel like a chore. A common term people might run across is “DLC Approved”. Understanding this common certification can pay off in a big way.

Lighting in an industrial facility, shopping mall, outdoor venue or parking lot is absolutely instrumental to improving productivity and safety. Without proper illumination, work won’t get done and safety could be compromised. If any commercial space is thinking about upgrading their lighting solutions, pushing the task off might not be an option. If purchasing is left scratching their heads when it comes to navigating all the terms that come along with securing commercial lighting, this could be exactly what they need to know.

What Is DLC Certification?

DLC certification is handled by The DesignLights Consortium® (DLC), a non-profit organization dedicated to accelerating the widespread use of high-performing commercial lighting solutions. The DLC established product quality specifications to promote high-quality, energy-efficient lighting solutions. They work with utilities and energy efficacy program members, manufacturers, lighting designers, and federal, state, and local entities.

The goal of the organization and certification is to create better energy efficiency programs by helping to identify and verify the highest-performing products and systems.

This voluntary certification initiative is set aside for LED technology and requires these lighting products to comply with specific standards in three areas:

  •         Distribution
  •         Color
  •         Longevity

Only an accredited laboratory can test DLC lighting requirements and these test results must be submitted directly to the DLC by the manufacturer.

Rebate Programs with DLC Certification

All across the United States there are utilities that base rebate programs on DLC standards. DLC certified products include high bays, wall packs, lab lamps, roadway luminaires, retrofit-kits, decorative LEDs, and LED panels. Rebates depend on the location of the installation and can vary from place to place. Consulting with qualified professionals like those at RLE Industries is a perfect way to make sure any business is getting the most out of upgrading their lighting fixtures.

Businesses can benefit greatly by adding DLC Approved lighting solutions in a number of different ways. They can save energy, cut electricity costs, and take part in these rebates. Without knowing what to look for, choosing the best lighting options for any unique application will be a monumental challenge. Having a clear understanding of DLC certification, what it means, and why it matters can help purchasers make an informed decision.

For any questions about DLC Approved lighting options, or inquiries about RLE Industries other services, give us a call at 888-318-0500.

Find DLC Approved fixtures right now!

Contact RLE Industries online.

Benefits of LED Lighting for Commercial and Architectural Applications

Architects and business owners have a lot to keep in mind when illuminating their buildings, manufacturing spaces or warehouses. Advancements in LED industrial lighting offer decision-makers more cost-effective options allowing architect’s limitless creative freedom. The benefits of LED lighting continue to add up. Design, function, energy and cost savings are all improved when compared to conventional metal halide or fluorescent fixtures.

Cost Savings

In today’s world, businesses and commercial spaces are constantly searching for new ways to reduce costs and save their business money. LED fixtures, both for commercial applications and architectural lighting designs, have enormous cost savings potential. Reducing energy usage, waste, and maintenance costs all add up to a more efficient technology and better-looking bottom line. LED fixtures for commercial and architectural applications have a variety of benefits beyond cost savings, but any business looking to reduce costs should consider updating their lighting fixtures with modern LED options.

Energy Efficiency / The Green Option

It becomes incredibly clear why commercial and architectural lighting has made the move to embrace LED fixtures when looking at the energy being consumed by outdated technologies. Incandescent lights use 10% of the energy they consume to create visible light, the rest is wasted in the form of heat. Halogen fixtures end up wasting 80% of the energy they consume in the form of heat and only 20% of that energy is actually used to create visible light. LED’s on the other hand turn 80% of the energy consumed into visible light and only 20% is wasted in the form of heat.

LED’s are by far the most efficient technology. Furthermore, LEDs can be recycled unlike incandescent bulbs. Using highly efficient LED lighting fixtures for commercial and architectural lighting applications can have a profound impact on the carbon footprint of warehouses, commercial spaces, and large buildings of any kind.

Service Life

LED lights can last up to 25 times longer than incandescent and halogen. This technology even outshines CFLs, with the average LED lasting three times longer than their mercury gas filled counterparts. With an expected operating time of up to 50,000 hours, that means that even if LED lights are in operation for eight hours a day, seven days a week, these lights would last around 10 years before burning out. The impressive resilience of LED technology makes them a perfect option for lighting fixtures in hard to reach areas as well as any commercial or architectural application.

Limitless Design Options

Architectural lighting focuses both on function and design. Fixtures must be visually appealing while also delivering the desired illumination. The versatility of LED technology allows them to be incorporated into sleek fixtures like the Lumenera line. Powerful lighting solutions paired with an elegant design make LED technology the perfect option for architectural lighting solutions.

LED technology has come so far over the past few years. Costs have fallen and more business owners are taking the steps to outfit their facilities with LED fixtures. Businesses in search of cost effective, energy efficient, versatile lighting solutions finally have the ability to achieve each one of these goals by utilizing a single technology. Commercial and architectural lighting is experiencing an incredible transformation, pushed forward through highly efficient and reliable LED technology.

For more information on upgrading the lighting in any commercial space or including LED lighting into an architectural project, call an RLE Industries lighting professional today at 888-318-0500.

HygenX Hi Clean Light

HiClean Plus LED High Bay is specifically designed for food processing environments, including: poultry and meat processing, food processing, cold storage, food service and other areas requiring certification to NSF standards. It has a safe optic lens that meets the ‘No-Glass’ requirement for food areas. HiClean Plus is made of high grade aluminum with non-exposed stainless steel screws, and its sleek design that allows for easy cleaning and ensures no recesses for bacteria to grow in. Designed with the unique needs of food processing environments in mind, you can specify HiClean Plus with confidence.



Item No. HB06-100 HB06-120 HB06-150 HB06-200
Optical Data
System Efficacy 140lm/W
Luminous Flux 14,000lm 16,800lm 21,000lm 28,000lm
Wattage 100W 120W 150W 200W
CCT 3000K, 4000K, 5000K
CRI Ra70, Ra80
Electrical Data
Input Voltage 100-240Vac / 100-277Vac
Input Surge Protection 2kV line-line, 4kV line-earth
Power Frequency 50/60Hz
Power Factor >0.93 >0.93 >0.92 >0.92
Ingress Protection IP65
LED Life Span >50000Hrs(Ta=30°C@L70)
Storage Temperature -40°C to +70°C(-40°F to +158°F)
Operating Temperature -30°C to +50°C(-22°F to +122°F)
Operating Humidity 15-90%RH
Housing Aluminum Alloy
Protection Class Class I
Weight / Packaging
Luminaire Net Weight 7.2±0.3kg
Outlook Dimensions φ489×200mm
Export Carton Size 560×260×565mm




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