Abstract: A fluorescent dye composition for inclusion in a fluid for leak detection applications is provided which is responsive to a broad range of UVA, blue, and UVA-blue light sources. The composition comprises a mixture of a perylene dye, a naphthalimide dye, and a hydrocarbon-based fluid, wherein the combination of the perylene dye, the naphthalimide dye and the hydrocarbon-based fluid are miscible in the fluid. A fluorescent dye composition is also provided that is effective for all automotive working fluids, including heavy lubricants and transmission fluids, synthetic lubricants and internal combustion oils, refrigerants, liquid and gaseous fuels, and hydraulic fluids. A fluorescent dye composition is also provided containing only a combination of perylene dye and naphthalimide dye.

Abstract: An inspection lamp for detection of a fluorescent material which absorbs electromagnetic energy in a specific excitation frequency band and which emits electromagnetic energy in a specific fluorescent emission frequency band within the visible light spectrum. The lamp includes a bulb housing, a light source within the bulb housing, and a dichroic filter. The dichroic filter is adapted to transmit electromagnetic radiation in the excitation frequency band of the fluorescent material and reflect electromagnetic radiation in the fluorescent emission frequency band of the material.