Question: Do people who sing with lots of power have a smaller vocal range? I have heard that if one sings with power, eg like an opera singer, you will get a smakler range. I feel that the more power I use the harder it is to sing higher.
Is there anything ti this?

Answer: 
This question is confusing me. Who among us thinks Whitney Houston or Mariah Carey or Luciano Pavarotti lacks power or extended range in their voices. There are certainly singers with power, but limited range, but I know of no evidence linking one with the other. With study, voices can be developed, power developed and vocal range increased, but it usually requires work.
No they don't. This is a bizarre claim, and if the person who made it has evidence - let's hear it!