When did you buy the Spec? The older generation had a light that worked well for low light species of plants, but not as much for the higher light kind. Most people upgrade that one.
The newer generation has a better light for plant growth. :)
Have your plants struggled to grow? They seem alright to me, but I'm not sure how long ago you planted them. It kind of just comes down to personal preference at that point. If you would like a brighter light, go for it. If it works for ya, just keep it haha.
I think it looks fine :) They said that my fluval spec iii's light wasn't bright enough for anything but low light plants, but I've got low and high light plants that are doing fine. (including a red plant, and I've always heard that red plants require high light to stay red.)
I've found a lot of bettas like lights that aren't suuuper bright anywho. *shrug*