Revisions log for question
What lets in light better – a double hung window or a window with a central mullion?
Revision 1
We are talking about the windows in the children's rooms. They are the second windows in each case, which means another floor-to-ceiling window on the gable in each case.
The windows in question (with roller blinds) are on the eaves side (south side) in the jamb (height inside the finished room is 1.80 m) and are currently planned for 2 m x 70 cm (BH 72 cm) (known to require fall protection). The children's rooms are 15 square meters, so there is more than enough lighting.
Meanwhile, however, we are no longer convinced that 2 meters is not too wide, we are now leaning towards a width of 1.76 m. However, the windows are low, which probably makes up for the width.
The only question now is whether we should use a double hung window for better light transmission or a window with a center mullion. Load transfer through the window doesn't have to be guaranteed.
Has anyone installed windows like this and can share their experience? Or how the light transmission is actually between the two versions?