To see the light beam, you have to get into this slot canyon around noon and you should book phototour that allow you about two hour for photographing instead of one hour for regular tour.
It had been difficult to book photographer tour but finally I got it. Anyway, on the day of the tour, the sky was very cloudy. So I had little chance for such light beam. My group almost went out the canyon when the sun beam was shining into the canyon. Then I completed my mission.