"Light" is a thinner variant, suitable for watermarks or delicate designs. The standard "Regular" is best for body text.
If you don't want to install anything, you can use Ka Naazhigai online:
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Pro Tip: Do not distort the font (stretching it vertically/horizontally). The calligraphic angles are scientifically designed; distortion breaks the visual rhythm.
: Press the Install button at the top of the preview window.