need light suggestions

[bryce.martin23]

Kinda new at this hobby and decided that I wanted to build an enclosed display for my oncidums and phalaenopsis. I have been reading that a lot of others are using standard flourecence lights and some are even using t-5. My display cabinet measures 21" W X 21" D X 48" T. I was wondering what kind of lights would work the best with the enclouse I have and how many watts. I was hopeing to use metal halides for the wide color spectrum but im not sure as if this kind of light will burn the plants. Any info will help.