Consider ambient temperature in lighting decisions

Select the correct fixture for the appropriate environment

01/17/2012


While facilities will differ in their lighting requirements, designers should consider several elements when planning a lighting retrofit. One such conideration is ambient temperature.

 

Heat is a tremendous challenge in many manufacturing facilities and not only degrades the light but can negatively impact the fixtures’ electronic components. Designers should always specify luminaires with a third party listing agency designation, such as Underwriters Laboratory, to insure that it is suitable for the ambient temperature that it will be subjected to.

 

UL classifications for light fixtures are typically 25ºC (77ºF), 40ºC (104ºF), 55ºC (131ºF) and 65ºC (149ºF). Light fixtures should always have a higher rating than the ambient temperatures at the location that the lighting fixture is mounted.  Ambient temperatures at mounting heights often substantially exceed those at floor level.

 

If for example, the ambient temperature is 35ºC in the area where fixtures will be installed, the luminaires should have 40ºC rating. An installation with a 59ºC ambient temperature should install 65ºC rated fixtures.

 

A 65ºC ambient rating is the highest fixture rating available. If the ambient temperature exceeds 65ºC, fixture ballasts should be remotely mounted in an area with a lower ambient temperature.

 

Foundries are an excellent example of an application that will require 55ºC or 65ºC UL rated luminaires. A quality high intensity discharge (HID) system with core and coil ballasts can operate efficiently at these higher temperatures when designed with adequate measures to dissipate heat.  Most electronic HID ballasts are also able to tackle 55ºC environments provided the fixtures include adequate heat sinks and conductivity to ensure the fixture keeps the internal temperatures (“case temperatures”) of the ballast below their maximum operating limit as indicated by the ballast manufacturer.

 

The electronic ballasts in fluorescent systems have similar construction but T5 and T8 lamps are not designed to operate in extremely hot or cold environments. Lumen output is usually substantially diminished within industrial environments where elevated heat is of concern.

 

For example, a heavy equipment manufacturer wanted to boost light levels to 60 footcandles in an area of the plant that was previously lit with a combination of aged high pressure sodium fixtures, T12 fluorescent luminaries and mercury vapor units. The manufacturer considered a fluorescent system but opted for a high bay HID system with electronic ballast because fluorescent luminaires are highly sensitive to heat.

 

The HID system installed, which uses 315-watt ceramic metal halide lamps, has a UL/CUL 55ºC ambient listing and can withstand the facility’s excessive heat, which is even worse during the summer. The manufacturing facility also benefitted from the luminaires’ extended 5-year warranty.

 

Lighting fixtures are available that are marine and IP66 rated to protect against the harsh elements found in hazardous environments and facilities such as food processing plants where hose downs occur daily.

 

 

 

Tamar Williamson's full article, ‘Illuminatig the Path To Savings' is one of the topics in Plant Engineering’s Forecast issue, which will be published in mid-February. To receive the digital edition of Plant Engineering in time for the Forecast issue, which also will feature the 2011 Plant Engineering Salary Survey, click here:



No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
World-class maintenance: The three keys to success - Deploy people, process and technology; 2016 Lubrication Guide; Why hydraulic systems get hot
Your leaks start here: Take a disciplined approach with your hydraulic system; U.S. presence at Hannover Messe a rousing success
Hannover Messe 2016: Taking hold of the future - Partner Country status spotlights U.S. manufacturing; Honoring manufacturing excellence: The 2015 Product of the Year Winners
The digital oilfield: Utilizing Big Data can yield big savings; Virtualization a real solution; Tracking SIS performance
Getting to the bottom of subsea repairs: Older pipelines need more attention, and operators need a repair strategy; OTC preview; Offshore production difficult - and crucial
Digital oilfields: Integrated HMI/SCADA systems enable smarter data acquisition; Real-world impact of simulation; Electric actuator technology prospers in production fields
Improving flowmeter calibration; Selecting flowmeters for natural gas; Case study: Streamlining assembly systems using PC-based control; CLPM: Improving process efficiency, throughput
Putting COPS into context; Designing medium-voltage electrical systems; Planning and designing resilient, efficient data centers; The nine steps of designing generator fuel systems
Warehouse winter comfort: The HTHV solution; Cooling with natural gas; Plastics industry booming

Annual Salary Survey

Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.

There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.

But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.

Read more: 2015 Salary Survey

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
This article collection contains several articles on the vital role that compressed air plays in manufacturing plants.
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.
This article collection contains several articles on strategic maintenance and understanding all the parts of your plant.
click me