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excuse me, i have a Crouse-Hinders light with the type of nLLK98,in its technical data there is \ II 2 D T80℃ IP65/ and what this mean?

This is the IEC rating for:

II - Equipment Group (gas, mist, vapor)

2D - Dust  Occaisional Occurance

T80C is the T rating

IP65  dust tight and protected against water jets