Concentration of solar radiation using a heliostat and fixed mirror

The effect of sunlight is a psychological and biological issue. For the illumination of interior spaces, that is, special light shafts in the sense of a natural daylight lamp, it works wonderfully. Outdoors, it does not work for most people. It does not get noticeably brighter during the day because the diffuse scattered light of the atmosphere anyway outshines a slightly diffusely scattering mirror (you don’t want a focal point but a wide light field). The surface area of the mirror is simply too small for the area to be illuminated. As mentioned, it works if sunlight is directed through a 1 sqm mirror into a 1 sqm light shaft with several frosted glass layers. But trying to brighten, from a 1 sqm mirror, a... let’s say 25 sqm garden area is not very effective. Larger mirrors are extremely susceptible to wind: the reflected light in the garden must not flicker.

Hello, good post. For us, it is about the lighting of the living room, not the garden...

Ok. Then I misunderstood it. So the blue circled spot is for the second deflection mirror?

Hello,

We are talking about the lighting of the living room, not the garden...

Even though I find the idea with the mirror quite charming and you probably don’t want to hear it:

I think you’re misguided!

Regardless of the costs and the hardly attainable permit for something like that; with a 1 sqm mirror you won’t be able to create a sun-flooded living room. Especially since that only works when it’s sunny. On the typical gloomy autumn and winter days, the whole thing is pointless.
I would guess that you can achieve much more with a really good lighting concept along with _good_ lighting for the living room.
Something like that can be professionally planned and executed; it does cost something too, but significantly less than the already mentioned 30 k€. And it works even in rain and darkness...

Best regards,

Andreas

Is the house still in the planning stage? If so, wouldn't it be better to include a light well in the plans? Or wouldn't retrofitting itself be a practical solution?

I would suspect that with a really good lighting concept along with _good_ lighting for the living room you can achieve significantly more.

But the OP is not asking about that. I have also already received a reprimand.