Well this is possible but your room has to have no doors or windows.
Do wood blinds block light.
Are faux wood blinds room darkening.
Light gaps are especially problematic on blackout shades where complete darkness is desired.
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.
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.
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.
Light blocking strips can cover gaps.
Their cell pockets trap heat and light between them besides lending you the privacy that you desire at all times during the day.
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.
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.
Wood blinds are made of different slat sizes which include 2 inch 1 inch 2 inch and 2 inch.
All blinds with slats will let in some light through the spaces between slats.
Ways to prevent the excess light.
Link to other question.