Drop light and trouble light are common names for a portable inspection lamp. They describe a way of working, not a hazardous-location rating. Two similar-looking lamps can have very different permitted uses.
Ordinary inspection work
A portable lamp puts the source under machinery, behind a panel or beside a workbench task. Check the lamp guard, handle, supply, cable and mounting instructions. A hook allows supported use only where the complete arrangement and mounting position are permitted.
Wet-location work
A wet-location or vapor-proof lamp addresses the environmental exposure specified for that model. Read the actual markings rather than treating the term vapor-proof as approval around flammable vapors. For construction work in wet or conductive locations, review the specific voltage/GFCI requirement.
Classified-area work
A handlamp for a hazardous area needs the exact approval required by that location. Check the class or Zone, gas or dust group, temperature limits and certification conditions. Explosionproof construction and intrinsic safety are different techniques; neither is established merely by using a low-voltage bulb.
Compare complete configurations
Identify the lamp voltage, supply input, transformer inclusion, cord length and both connector ends. Match replacement components to the approved assembly. Physical fit and wattage alone do not establish compatibility.
Use the hand-lamp range to compare working formats, then select the documented configuration for the task.
References: OSHA 1910.307 — Hazardous (classified) locations · OSHA 1926.405 — Temporary wiring and portable lighting