Found a new word for light
Apart from velicham and vettam I found another malayalam word for light
In old tamil ilangu meant shine, bright etc and it is cognitive of malayalam ലങ്കുക(languga) meaning same and also old tamil uses ilakkam for light, brightness etc and these words are from proto Dravidian root *el/il means light, brightness as like *oli and it's also seen in telugu/kannada enda meaning daylight/sunlight, so ilakkam meaning light became probably lakkam in malayalam which will be a new word for light in malayalam and I know lakkam means issue/version in malayalam but eventhough I don't agree linguistics connect it to sanskrit lakshya but here it is from a clear stated dravidian root *el/il so lakkam meaning light and meaning mark/issues maybe have different etymologies or maybe they are counterpart words of same etymologies and lakkam meaning issue/mark/numbers got mistaked as sanskrit loanword