I use a T5 in a Marine Tank for growing the sea weed and does a relay good job.
I have only used the Exo Terra Repti Glo 2.0 in dart frog viv's and other vivs with plants. I find plants do relay well if there closer to the top and the ones on the bottom of the viv strugle a bit i find.
Lol, yes its real hard to choose what type of Dartfrogs, i bet you get more than one type ;O)
I find the shows are relay good to get the common dartfrogs, the price is not bad either.
Hell yes the oophga pumilio are relay nice, love there call as well. Tincs are relay lovely as well, i got a nice group of 4 in a viv and they eat like there is know tommorow.
My Yellow and Black -Dendrobates leucomelas i hear calling in the morning and evenings, they love a good blast
Here is one of the video's of me dart frog tanks: YouTube - Dendrobates leucomelas Call