Hello Lighting Pro

I’m renovating a pharmacy shop. Basically I’ve got normal halogen downlights lighting up both sides of the wall stock. I have 6 downlights on each side spanning ~9m each side but the lighting is still very dark.

I was recommended to get metal halide shoplighters.

Just want to know if that is suitable and whether 70W or 150W. Will 70W be too bright.

Many thanks