Creating slips of sun/moonlight in a cave using dynamic lighting?

I'm trying to create a cave system with some cracks in the walls which allow natural light in. The video on Youtube suggests this is possible by setting a light source on the Light layer - players would see the light, but not the object. However, when I place an object on this layer I don't get the option to turn on emit low light (or anything else that's on the dynamic lighting tab when you right-click a token). 

Hmm.  I just tried this and it worked fine for me. Are you the creator of the Game?  DL is only active for games created by Plus and Pro subscribers.  If someone else created the Game and they are a Free subscriber, the Game won't have access to the DL system.

Once you place the light source, double left click on it and the token properties will appear.  There you can set low light, bright light, distance, etc on the dynamic lighting tab

Wow, honestly that might just be it - the double clicking. I was so used to looking for the widget like on the tokens page. Thanks gang