A sealed work light and an explosion-protected light solve different problems. A vapor-tight enclosure helps protect its internal parts from the exposure stated by its manufacturer. Hazardous-location equipment must also address ignition risks in the particular classified area where it will operate.
What vapor-tight tells you
Terms such as vapor-proof, vapor-tight and weather-resistant describe environmental protection, but their scope varies between products. Look for the actual wet-location marking, ingress rating, material compatibility and installation instructions. A sealed housing alone does not establish a Class I, Division 1 or Class II approval.
An IP rating concerns entry of solids and water. It does not demonstrate resistance to every chemical, permission for underwater operation or approval around flammable gas or combustible dust.
What explosion protection adds
An explosionproof enclosure is one protection technique for approved gas-hazard applications. Intrinsic safety, dust-ignitionproof construction and other techniques work differently. The complete marking identifies the location and substances covered; the word explosion-proof does not make a light suitable for every hazardous area.
Choose for the actual work area
Start with the site's documented classification. Then match the complete assembly, including its lamp, cord, connections and permitted mounting, to the location. Check gas or dust group, temperature marking, ambient range and supply requirements as separate items.
For a nonclassified damp maintenance area, a wet-location hand lamp may be appropriate. A tank, grain-handling area or process unit can introduce additional hazards that require a different selection. Use the location assessment rather than the industry name to decide.
Before replacing a lamp
Compare the replacement's exact model and markings with the existing equipment documentation. Similar appearance, matching voltage and a sealed lens are not enough to establish an equivalent hazardous-location assembly. Browse hand lamps by format, then confirm the required configuration and documentation.
References: OSHA 1910.307 — Hazardous (classified) locations · IEC — IEC 60529 enclosure protection · UL Solutions — North American hazardous-area certification