Re: Lighting - a daft question?

to get  the spectrum  needed, they have to use different ( and more
expensive ) phosphors for the bulb. Also there is the mass market of the
"Normal" bulbs being made/sold, compared to the small market for the true
sunlight types.  Reefs and some plants

the Normal bulbs are about 4500k, MOST of them do have their Kelvin color
temps listed on the package.

Steve





"John" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Why are marine Metal Halides so expensive when compared with  a standard
> 400W Metal Halide 'high-bay' lights used in Industry at a fraction of the
> cost?
>
> Has anybody tried using Xenon or Halogen lighting over a reef tank? Could
> either of these give a better output or light spectrum than Metal Halides?
>
> John Carroll
>
>