Application of Hazard Location Lighting
Hazard location lighting, such as explosion-proof sight glass lights, is vital in industries where hazardous conditions exist. These are environments where the potential for explosion is elevated due to flammable gases, vapors, dust, or fibers. Industries frequently requiring hazard location lighting include oil and gas, chemical processing, pharmaceutical, power generation, and food & beverage manufacturing.
Hazard location lighting, like our explosion-proof sight glass lights, illuminates vessel sight glass viewports, dedicated light ports, or flow indicators. This enhanced visibility allows operators to monitor processes safely and effectively. Our lights are environmentally sealed and designed to operate safely without providing a spark that might ignite an explosive environment.
Difference Between Class 1 and Class 2 Explosion Proof
In the world of hazard location lighting, “Class” refers to the nature of the hazardous material present in the environment. Classifications are governed by the National Electrical Code (NEC) in the United States or comparable standards elsewhere.
Class 1 explosion-proof lighting is necessary in areas where flammable gases or vapors may be in sufficient quantities to produce explosive or ignitable mixtures. These locations typically include petroleum refineries, gasoline storage or dispensing areas, and dry cleaning plants, to name a few.
On the other hand, Class 2 explosion-proof lighting is designed for environments hazardous due to combustible dust. Examples include grain elevators, coal processing plants, or manufacturing plants that generate substantial dust, such as sugar refineries and paper mills.
At L.J. Star, we offer a range of explosion-proof lighting solutions, from traditional halogen to LED and fiber optic. All meet UL or ATEX requirements, ensuring they are suited to these specific hazardous environments. By adhering to these rigorous standards, we remain committed to delivering products that enhance safety and efficiency in your manufacturing processes.
Frequently Asked Questions
What is non-explosive (explosion-proof) process lighting?
Explosion-proof process lighting, sometimes informally called non-explosive lighting, refers to fixtures designed for industrial environments where flammable gases, vapors or combustible dusts may be present and where a standard light could become a dangerous ignition source. These fixtures are sealed and constructed so that any internal arc, spark or ignition is fully contained within the housing and cannot ignite the surrounding atmosphere. They must meet strict national and international classification standards and are required wherever process conditions create a credible risk of explosion.
LJ Star’s Lumiglas® Ex-Light series is available in LED and fiber optic configurations, while the USL 07 series unit can be fitted with halogen lamps if needed, suited for AC or DC voltage. It provides certified explosion-proof process lighting for pharmaceutical, chemical, food and beverage and other hazardous process industries.
What does “explosion-proof” actually mean for a light fixture?
“Explosion-proof” is a precise engineering and regulatory term. It does not mean a fixture prevents an explosion from occurring, but rather that the fixture’s housing is built to contain any explosion that might occur internally and prevent it from igniting the surrounding atmosphere. Gases that do escape the housing are cooled below ignition temperature before reaching the outside air, ensuring the hazardous atmosphere is never reached.
LJ Star’s Lumiglas® explosion-proof lights are constructed of corrosion-resistant die-cast aluminum alloy and are shock-proof, dust and waterjet-tight. They carry UL certification confirming they meet this exacting standard for Class I hazardous locations.
What is the difference between explosion-proof lighting and intrinsically safe lighting?
Explosion-proof lighting and intrinsically safe lighting represent two fundamentally different approaches to hazardous location safety. Explosion-proof fixtures are built to physically contain any ignition that occurs inside the housing, while intrinsically safe lighting operates on so little electrical energy that it cannot generate enough heat or spark to ignite a hazardous atmosphere in the first place. Intrinsically safe designs tend to be lower output, while explosion-proof designs can produce substantially more light, making them the practical choice for vessel illumination.
LJ Star offers both approaches to meet different application needs. The Lumiglas® Ex-Light series serves explosion-proof applications requiring high-intensity illumination, while the Lumiglas® Intrinsically Safe Rectangular Light Series REL-01 is available for situations where a low-energy intrinsically safe solution and rectangular shape is the appropriate fit.
What industries most commonly require explosion-proof lights?
Explosion-proof lights are most commonly required in classified hazardous locations where flammable gases, vapors or combustible dusts are regularly present as part of normal operations. Oil and gas, chemical processing, pharmaceutical manufacturing, power generation, food and beverage (particularly where alcohol vapors or fine powders are present), paint and coatings production and biogas facilities all routinely require explosion-proof lighting.
LJ Star’s Lumiglas® explosion-proof light series is engineered specifically for pharmaceutical, chemical, and food processing environments. With aluminum or stainless-steel construction and UL/ATEX certifications, these lights meet the demanding requirements of all of these industries.
What certifications are required for explosion-proof lighting in North America?
In North America, explosion-proof lighting for hazardous locations must be listed and labeled by a nationally recognized testing laboratory such as Intertek (ETL) or CSA, and should comply with applicable UL standards, primarily UL 844 for luminaires in hazardous locations. The fixture must be specifically marked for the Class, Division, and Group of the environment where it will be used, as well as its temperature classification confirming maximum surface temperature stays below the ignition point of the substances present. ATEX certification is not required in North America but is necessary for equipment used in the European Union.
It is important to note that not all explosion-proof lighting products carry third-party certification across all configurations, and verifying documentation for the specific product and application is essential. LJ Star’s Lumiglas® USL08LED-EX carries UL 844 listing for Class I, Division 1 and 2, UL 1571 wet-location approval, and an IP65 rating, with third-party compliance documentation available directly at www.ljstar.com.
Can LED technology be used in explosion-proof fixtures?
Yes, LED technology can be used in explosion-proof fixtures and is today the preferred choice over previous-generation halogen and incandescent sources. LEDs offer up to ten times the service life of older halogen bulbs, consume roughly half the energy, and can be tuned to precise color temperatures that improve the accuracy of visual process inspection. They are also more resistant to shock and vibration, which is particularly valuable in process environments.
LJ Star’s Lumiglas® USL08LED-EX is a UL-listed explosion-proof LED light that delivers all of these advantages. It meets Class I, Division 1 and 2 certification requirements and offers high-output illumination to help facilities optimize processes through greater visibility.
What is the difference between explosion-proof and shatter-resistant lighting?
Explosion-proof and shatter-resistant are two entirely different safety properties that are sometimes confused. Explosion-proof refers to a fixture’s ability to contain any internal ignition, addressing the electrical risk of a spark or arc causing an explosion in a flammable atmosphere. Shatter-resistant refers only to the physical durability of the lens or globe, designed to prevent glass fragments from contaminating a process or injuring workers if the light is struck or broken.
A shatter-resistant light is not explosion-proof, and an explosion-proof light may or may not use shatter-resistant glass. Both properties can be important in process environments, but they address entirely different hazards governed by different standards. LJ Star’s Lumiglas® Ex-Light series features robust aluminum construction, sealed assemblies that meet explosion-proof certification, and durable lens materials suited to demanding industrial environments.
How do you maintain explosion-proof light fixtures to stay compliant?
Maintaining explosion-proof light fixtures in compliance requires regular inspection of the housing integrity, seals, gaskets and all threaded entry points to ensure no degradation has compromised the explosion-proof rating. Any damaged gaskets or cracked housings must be replaced immediately using only manufacturer-approved parts. Bulb replacement in hazardous areas typically requires a permit and electrical lockout/tagout procedures, which makes the extended service life of LED technology particularly valuable in classified locations.
Fewer replacements mean fewer high-cost, high-risk maintenance events in hazardous areas. LJ Star’s Lumiglas® LED Ex-Lights are engineered for up to five years of maintenance-free service, dramatically reducing the compliance burden compared to halogen alternatives, and LJ Star provides installation guidelines and support documentation at www.ljstar.com.
What makes a harsh environment different from a standard hazardous location?
A hazardous location is formally defined by the presence of flammable gases, vapors or combustible dusts and is regulated under the NEC Class/Division classification system. A harsh environment is a broader category that encompasses extreme conditions such as corrosive chemical exposure, high-pressure washdowns, elevated humidity, extreme temperatures, heavy vibration or physical impact, all of which can degrade standard lighting fixtures even when explosion-proof ratings are not required. Many industrial process areas are both hazardous and harsh simultaneously, requiring fixtures that address both sets of demands.
LJ Star’s Lumiglas® Ex-Light series is designed for exactly these combined conditions. Available in aluminum or stainless-steel construction, shock-proof, waterjet-tight to IP65 and certified for Class I, Division 1 and 2, these lights are built for wherever a process environment is both dangerous and physically punishing.
What housing materials are used in explosion-proof lights for corrosive or wet environments?
Explosion-proof lights for corrosive or wet environments are most commonly housed in die-cast aluminum alloy, which provides an excellent balance of strength, corrosion resistance, and weight. For more aggressive chemical environments such as strong acids or caustics, stainless-steel housings offer superior resistance to chemical attack and are also preferred in sanitary applications where surface cleanliness is required. High-quality silicone or neoprene seals and gaskets protect all entry points from moisture and chemical ingress.
LJ Star’s Lumiglas® Ex-Light series is offered in both corrosion-resistant die-cast aluminum alloy and stainless-steel configurations. This ensures facilities can specify the right material for their specific chemical exposure and washdown environment.
What temperature ranges can explosion-proof process lights handle?
Explosion-proof process lights are designed to operate safely across a defined ambient temperature range, and their temperature classification, known as the T-code, defines the maximum surface temperature the fixture can reach. That surface temperature must remain below the autoignition temperature of the gases or vapors present, making T-code selection a critical part of specifying the right fixture. Most explosion-proof lights are rated for ambient operating temperatures up to 40°C (104°F), though some industrial designs accommodate higher ambient conditions.
LJ Star’s Lumiglas® USL08LED-EX carries a T6 temperature classification at 50°C ambient, limiting maximum surface temperature to 85°C. The LJ Star engineering team can help match the appropriate temperature class to the specific gases or vapors present in a customer’s process environment.
When should a facility use explosion-proof process lighting versus upgrading to a camera or remote monitoring system?
Explosion-proof process lighting is the right choice when operators need real-time, direct visual observation through a sight glass to assess process conditions such as color, clarity, agitation, foam level or flow during routine operations and critical process stages. It is simple, reliable and requires no data infrastructure. A camera or remote monitoring system becomes preferable when the observation point is difficult or unsafe for personnel to access regularly, when continuous recording is needed, or when multiple operators require simultaneous access to the same process view.
For facilities that need both, LJ Star offers the Lumiglas® K25-Ex VISULEX explosion-proof camera system, approved for Ex Zones 1 and 2, Group IIc, and IP67. It can be paired with Lumiglas® explosion-proof lights to provide both high-quality visual illumination and remote video monitoring from a central control room.