According to the window designers choosing the smaller slat sizes will lower this risk while creating tighter closure.
Do wood blinds block light.
Are faux wood blinds room darkening.
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.
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.
Ways to prevent the excess light.
Well this is possible but your room has to have no doors or windows.
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.
Also you have to keep in mind that it is block out all light is an impossible thing to do no matter how effective your shutter are.
Their cell pockets trap heat and light between them besides lending you the privacy that you desire at all times during the day.
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.
All blinds with slats will let in some light through the spaces between slats.
Light gaps are especially problematic on blackout shades where complete darkness is desired.
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.