Hello everybody.
I’m using D5 render for 3 months now, and the program is great. I have problem with light reflections in disco balls which are mounted under the ceiling. I do not have light spots on the walls and ceiling etc. shimmering light effect.
and render looks plain:
HI. All you need is a bit of tenacity, you have to try everything, especially D5 has provided us with several effects, you just need to know how to use them and watch the videos on YouTube every now and then of some tutorials on how to improve the work and apply the effects.
I’m happy to have lent you a hand when I could. 
Thanks for your help.
Caustics in transparent material also helped!