Besides their sleek and minimal appearance they are also excellent blockers of light and heat when they employ more than one sheet of fabric in their construction.
Do wood blinds block light.
Link to other question.
Light blocking strips can cover gaps.
Window treatments come in various fabric options which include sheer light filtering room darkening and blackout materials and depending on your requirements you can choose the right one.
Keeping the blinds close block most of the light but sometimes blind slats can let a little amount of light to enter your home through the gaps between slats.
Are faux wood blinds room darkening.
Roller shades naturally have large gaps to the sides of the fabric so these light blocking strips are the perfect solution for maximum light control.
All blinds with slats will let in some light through the spaces between slats.
Light filtering blinds diffuse the harsh sunlight into soft rays room darkening blinds to block out most of the light and blackout treatments are built to obstruct all the light making any space dark.
Although there are some blinds with fold flat slats that close tighter to block more light if you want to block a lot of light you re better off with shades.
According to the window designers choosing the smaller slat sizes will lower this risk while creating tighter closure.
Well this is possible but your room has to have no doors or windows.
Basically they can really block a substantial amount of outside light from coming into your room or area.
Light gaps are especially problematic on blackout shades where complete darkness is desired.
Ways to prevent the excess light.