Well, I plan on using the 6500K light for salamanders, but they stay hidden during the day so it shouldn't matter for them. It'll just keep the moss and plants growing good
But, I generally have heavily planted vivs for my frogs or I provide them with many spaces to hide. I haven't had any issues, but certainly don't want to! I like the idea of these low watt, blue incandescents, but they don't stimulate plant growth, which will not work in a planted viv!