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Learn PolishHello Ania, thanks for your question. Yes, you are right, it might be confusing.
lekki means light however in different sense than the light from the sun or light bulb.
In this case light is an adjective, the opposite of heavy. The camera is very light and easy to use. The Polish translation is: Aparat fotograficzny jest bardzo lekki i łatwy w użyciu.
light (a noun) is translated in Polish as światło. It is exactly the same maning like in English.
It can be used in religious context but there is also another Polish nouns maybe more suited. It is światłość (when I put this in Google translate it gives me light as well).
holy in Polish is święty. Not sure about etymology of this term, it may have been created from światło but now it is a separate word with different meaning.
lekki - light (adjective, opposite of heavy)
światło - light (noun)
święty - holy (adjective)