The light is led, and I cant find any information online in regards to it's color temperature. And oh my, thank you for the informative response. Out of curiosity, if you do have any experience with it, if I were to dose CO2 in a tank to boost growth, lets say with either something like carpeting plants or just what I have already, would I need to continue dosing after the plants have grown to the size I want or may I just stop once I get the desired effect?
I would not consider CO2 here, since frankly you would not see much benefit for the expense and effort. And I can almost guarantee the light would have to be increased, and then the other nutrients. I'll explain a bit, as it is important to understand the whole picture. So often this or that store or whomever suggests "CO2 will fix everything" or similar, but it can make things very much worse.
Aquatic plants need a certain level of light intensity to drive photosynthesis, and each species is a bit different. We can group plants into some arbitrary groupings like high light, moderate light and low light, and this is not bad to work with. But in order for the plant to use the light intensity to photosynthesize, 17 nutrients have to be available (we're talking aquatic plants here obviously). Provided they are all present in sufficient quantities, the plants will photosynthesize full out. This stops when something is no longer sufficient, be it light or one or more nutrients. And just to add to the complexity, some nutrients if in excess can cause the plant to shut down assimilation of certain other nutrients. My point in this is that we have to be careful. An enclosed aquarium is a very different environment from nature.
With planted tanks we talk of high-tech down to low-tech or natural. The high tech uses the most artificial stimulants to push the plants, whereas the opposite end uses the very least and relies more on nature. I prefer the latter, or close to it, for a couple of reasons. First, the less we intervene with stimulants, the less risk. If we intend keeping fish in the tank, we must not lose sight of the fact that every additive is going to get inside the fish. Many who do high-tech systems have no fish in the tank, it is an aquatic garden. And there is much in between.
There is a fair bit of natural CO2 produced in a fish tank. Respiration of fish, plants and some bacteria produces CO2, but even more occurs from the breakdown of organics in the substrate, which is why we tend not to mess with the substrate very much. If you were to add CO2 to your present tank, you would within a short space of time have an explosion of algae, because the plants cannot use the CO2 without more light intensity and the other 16 nutrients. And the latter are probably in rather short supply. They come in with water changes, fish foods, and if needed fertilizers. But too much of any of these can trigger algae because it throws out the balance of light/nutrients. This is something that rarely occurs in nature because of the vastness of the system.
From what I see in the photos, I would say you are getting very good growth from the swords. We haven't discussed p[ant additives, and you might or might not benefit from say a comprehensive supplement. This is one that has everything (nearly), and is safer because there is less chance of upsetting the balance among the nutrients.
I have never used CO2, and have no intention to ever start, because it would take me way above the natural method I want, for the sake of my fish which are more important to me. But here are some photos of 4 of my tanks that may illustrate what is achievable with minimal effort. Once the light is settled, and then nutrients are in balance, the system basically takes care of itself, and that means much less chance of something going wrong and harming the plants or fish.
Byron.