problem light view reflector

[doking]

I get an unusual problem with autocad 2015
I made a model, attributed materials and lights
are lights of two types, a 20ine of dot lights factor of intensity 4 and 4 reflectors factor intensity 150
during normal display with deactivated default lighting I can easily see all perfectly working lights but if I make a make the 4 lights of the spotlight turn off while all the other lights work
I tried to disable most layers and in this condition in the rend the lights go back to work but the reactivates everything that turns out again
what can depend on?
Thank you in advance

 

[GP.]

I'd like to say you have objects that "dark" them.
try to turn off a layer at a time in order to understand what the manager is.

 

[doking]

What a fool I am
I designed the projector with all the "glass" and put the light projector on the lamp of the projector as it should be in reality, of course it is covered by the "glass"
thanks gp. you are always kind and helpful

 

[GP.]

Please.

ok, but if the glass is transparent....

 

[doking]

I moved the torch to the outside, colored the "glass" of yellow and 2 cm away I created a dot light with intensity factor 0.3 so now it is even more realistic :finger:
But if I made it transparent I would also illuminate the inside of the spotlight and not only the "glass"............