RPi Picade and turning off the display

Since Peter has the fancy Picade in his bedroom, I wanted to turn off the display completely at night. Even with the screen saver, it has a bit of a glow to it. So, I found a few commands that I added to my crontab:

0 20 * * * /usr/bin/vcgencmd display_power 0 > /dev/null
0 8 * * *  /usr/bin/vcgencmd display_power 1 > /dev/null