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Mercury Vapour or Metal Halide ??

What is the advantage of using Metal Halide as opposed to Mercury Vapour or
Flourescent lights in a fully planted aquaria ??

Cost ?   Spectrum ? 

In the UK, I only seem to hear about MVP or Flourescent lights being used in
planted tanks - certainly not Metal Halide. These appear to be used only by
the Marine/Reef chaps.

Are we missing the point over here ? or am I wrong  ?

Andy M Moore - Blackpool, England
andy at ascot_u-net.com

I decided to stop drinking with creeps
I decided only to drink with friends
I`ve lost 30 pounds !

Ernest Hemingway