Thank you very much for your kjnd explanation. I m not J Kho, i borrowed his phone to watch You tube. May i ask:; at 13:00 minutes of your theme, about THE COLOUR OF THE LIGHT ABOVE THE HEAD, HOW DO WE SEE THE LIGHT? WHAT METHODS TO USE TO SEE THE COLOUR OF THE LIGHT ON OURSELVES? AT NIGHT, WITH WHAT KIND OF LIGHT? TORCHLIGHT OR?? PLEASE PLEASE SHIFU, JING YA, Kindly inform . With much thanks.