While being shown in the light, a contestant cannot see the other contestant's reaction.
Each contestant is standing at opposite ends of the dark room with a very large two-way mirror between them.
That limited the number of people who could speed-date at any given moment to less than half the participants, leaving the rest to mingle, or not.
Many speed daters didn't seem to mind — perhaps because most had never done it before. One speed-dating couple even danced inside the car.
Joining the other on the balcony signifies that the contestants both want to pursue a relationship; exiting the house through the front door signifies that they do not want to pursue a relationship.This is done, in part, by using video editing software to fade the infrared image of the person being revealed to black before they are illuminated, then seamlessly showing the color image of the person being revealed as it is faded in and out.