What are these things?

Hint: They are projectors.

Cracked by: tanwi, KK, rickde, rohanquizzer, Anjul, Rogi, Manish Achuth, Bharath, Kaustubh Mhatre, Sumanth Patlolla, Rajesh, raklodramA, anurag, Mayukh Bose, jowens, Ananth and Vishwas B Sharma