Chris L Peterson wrote:

By my calculation, Saturn (now 9.1 AU from the Sun) receives 1.2% of the
sunlight received at the Earth. The amount of sunlight absorbed is more
difficult to calculate than simply comparing atmospheric density. The
Earth's atmosphere actually only attenuates about 20% of the incident
light, and much of that is scattered, not absorbed. Assuming your value
of 10% transmission for Titan, however, the surface light will be 0.12%
of Earth's. On the Earth, at local noon over the middle and tropical
latitudes, the illumination is about 130,000 lux. So at local noon on
Titan, figure 160 lux. That's quite a bit brighter than a darkly
overcast day on the Earth, which measures at 100 lux, and some 600 times
brighter than the full Moon. Office lighting guidelines normally specify
100 to 400 lux as the target range. Late twilight is normally taken as
10 lux.

In other words, the illumination on Titan would be quite comfortable for
human eyes- no artificial illumination required for most tasks.

During daytime. The Titan night length is equal to 8 Earth days.