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i dont think many responsible keepers are going to agree with keeping multiple herps in a tank together. i think it can be done with care, but you may be trying to get too much into one viv with multiple species of reptile and amphibian. try limiting yourself to one reptile and one amphibian and choose species that have different space requirements. a small reptile in the upper regions and a frog on the botttom seem to be the most succesful (with limiited success) matchup. also you need to make sure both of the animals care requirements are met to perfection. when researching these types of set ups its easy to research animals whose "acceptable" range overlap. however, with the added stress of another species in the tank its important to match the animals to their ideal requirements for them to strive. this is why i think its important to choose animals from the same area. also, if these animals are running across each other in the wild, they may be less prone to stressing each other under constant contact.
as far as answering the lighting question, i think you should use as much as you can without roasting the inhabitants. some plants may have negative reaction to your intense lighting, but with amphibians you need to look at the heat/humidity issue. there arent too many (if any) commercially available amhibians that will live at the levels you have there. if you can get the temps down to around 78-80 at its peak and get humidity up to 75 or more (at minimum) you would open youself up to a good range of herps to choose from. a cooler temp wouild be needed if you are going to try and keep most salamanders.
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Landon
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