Truly, for Humans, it's completely Black out there. The sun is just a pin prick, that will still burn your retinas off though.
That is not how it works. If you knew exactly where to look when you were in deep space it would not hurt your eyes to look directly at the Sun. You need to understand how a deep space Sun sensor works, and why the less dense the interstellar medium the more difficult it is to be able to 'decode' the EM radiation emanating from distant sources. Similarly, the star trackers needed for space navigation become more expensive the further out you want to go, but you could only buy a star tracker capable of deep space navigation (if you could even afford one, and you need at least 3) from companies who are corporate arms of the military industrial complex. And they would want to know a great deal about you and your intentions, and then still might not sell to you.
In trying to find any information about surface light levels on Mars I found this pdf, and though there are still no actual numbers, the effects of the light on surface observations are interesting.
The Martian Sky and Its Illumination of the Martian Surface
Nothing much has been done to examine the lunar sky since 1973
The measurements of sky brightness on Lunokhod-2
The unexpected brightness of the lunar sky was attributed to the scattering of sunlight by the fine lunar dust, but as there is no proof that the sun emits any visible light then the light must have been created by the atmospheric dust, and fluorescence of silica particles is an accepted and well utilised phenomena.
I believe The reason that NASA does not have a rover on the surface is that detailed observations of the true nature of the lunar lighting would destroy the solar constant model for one thing, and if a direct measurement of solar heat by a Pyrheliometer were to be performed it would be found to be very cool in comparison to expected levels. No good for solar concentrators to smelt lunar ore.
Interesting that the Russian rover was driven by remote control from Earth, the signal time delay is insignificant. So I'm wondering if Elon Musk would be game for putting a sensor loaded remote controlled Cybertruck on the surface. Wouldn't that be a hoot!