Could (sounds a bit better than 'would' in this sort of sentence) you please tell me what kind of lights do you use in your home?

I am doing a survey here and I wanted to know what kind of lights do you use in your home, I have posted some pictures below. Waiting for your information (could say "response" instead of "information")... :)

1.Would you please tell me what kind of lights do you use in your home? (second clause is not a question)

2.May I ask "What kind of lights do you use in your home"? (quoted verbatim text needs 'do' 

3.Or simply 'What kind of lights do you use in your home?' (really same as the first)

The second case (with quotes), and the third case are in normal question form.

I have difficulty knowing how to explain the first case - why we omit the 'do'  - except the second clause is not really the question

I am doing/conducting/carrying out a survey here wanting to know what kind of lights do you use in your home; I have posted some pictures below. Waiting for your information/response/answers... :)

REPLY: Energy efficient lights or CFL's - bottom row.  All the lights with compatible fixtures in most homes were replaced for free by the government about 5 years ago.  Incandescent are being/have been phased out.