You asked

Is the panasonic lumix g100 good in low light?

The G100 isn't the camera I'd pick for low light. Its Micro Four Thirds sensor is the smallest of the common sizes, and a bigger sensor gets you roughly two stops more light at the same framing and f-number. The body also has no stabilisation, so dim scenes at slow shutter speeds depend on your lens.

Fast primes do most of the work here. The Panasonic Leica DG 25mm f/1.4 II, Panasonic Leica DG 12mm f/1.4 and Olympus M.Zuiko 25mm f/1.2 PRO gather far more light than any kit zoom. For a stabilised zoom, try the Olympus M.Zuiko 12-100mm f/4 IS PRO. You can see every lens that fits on the Panasonic Lumix G100 page.

Written by Claude from this site's pages.

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