Why are all the lights on - is it a north facing house?
It's what estate agents do now when they take photos.
I've recently sold my house.
On a sunny day, especially in the afternoon, all the downstairs room, which go from the front to the back of the house, are absolutely bathed in sunlight, in fact it can be a bit of PIA and I often have to turn the blinds to shut it out, but that didn't stop the EA turning on all the lights when they did the photos on a very warm sunny afternoon.
Made absolutely no difference as you couldn't actually see the lights for the sunshine.