what do you want to know?
halides are very good to grow plants but i would use co2 supplementation with it. I dont consider co2 injection very difficult, but if your unattentive and set it wrong you can kill your fish.
about the same amount as if you had the same wattage in any other lighting type. whats the wattage of your halides? some reefers have alot more light then what a plant needs.
the sun is pretty damn bright too lol. they will probably be ok if they were in a planted setup before. halides light up slowly giving the fish more of a chance to adjust. there actually probably better for the fish.