We have a LED reading light in our living room, taking about 5W or so. Not very bright as you can imagine. Tuna the cat was sitting about 2 meters from it, and that gave me 1/13th of a second with the lens wide open at f/1.8 and ISO 6400, hand-held. No noise reduction, no sharpening:
Tuna the cat in low light, August 2014. Olympus E-PL5 with 45mm/1.8 lens at f/1.8.
Thanks for viewing.