Light shafts and basement windows, sensible dimensions, material, etc.

Hello,

we are building a small partial basement with a black tank as follows:



We will take care of the basement windows and light wells. Now I am researching what would be sensible in our case regarding the dimensions, the type of material, and ultimately also concrete products and manufacturers. Below is a brief list of some framework conditions:

[*]Basement within the thermal envelope of a KfW55 house
[LIST]
[*]12 cm insulation
[*]poured with in-situ concrete
[*]black tank

[*]purely utility basement with

[*]Basement 1: Workshop and storage
[*]Basement 2: House connection room with technology for air-water heat pump, photovoltaics, electrical
[*]Basement 3: Storage for food
[*]no drainage in the basement, so no washing machine connection, sink, or similar

[*]The soil report indicates an infiltration rate of 10E-3 to 10E-4 m/s, so water drains well through the gravelly/sandy soil
[*]The backwater level is above the window sill
[*]In the picture above, an extension is being added to an existing semi-detached house

[*]a wall goes off to the top left and directly to the left of the house there is a bicycle shed, therefore not much light will reach basement 1

What is important to us:

[*
good ventilation option (a workbench is to be installed in basement 1 and good ventilation must be possible depending on the type of work)
[*]somewhat light, although it is clear that electric light will probably always be needed
[*]burglary protection
[*]possibly an escape option in an emergency. I am not sure if this is necessary, but I thought that if you are working in the basement and don’t notice anything and there is, for example, a fire upstairs and the stairwell/hallway is affected...
[*]installation should be (with the help of instructions and support from more knowledgeable persons, etc.) also possible for me as a layperson and not too complex
[*]affordable, but not cheap


What I currently think:


[*]Because of KFW55 we need
[LIST]
[*]triple-glazed windows
[*]adjusted insulation board for the light well


[*]GRP light well is better regarding installation
[*]because of the backwater level the light well must probably be sealed watertight
[*]drainage of the light well is probably sufficient with discharge into the gravel underneath due to our soil
[*]maybe a combo package with suitable window, light well, insulation, and installation kit?
[*]window & light well size, don’t know what is sensible here...
[*]manufacturers I have looked at so far are ACO and MEA, but I am still very unsure what would be suitable due to insufficient knowledge...

I am grateful for any tips/advice regarding the above points!