Depends on how you grow really. If you scrog, have a large grow area that’s not full, or run multiple rows of plants, side lighting is kind of a waste. In all of those instances you would be better off investing in your main lighting.
If you are in a really small area with little room for top lighting, or you have 1 plant that you veg out for a long time, side lighting can help you out quite a bit and something like that would probably be fine.
You want to keep things in your grow space fairly balanced. If you’re running multiple plants, it requires a lot of rotating, turning, and moving stuff around. And then the little amount of time your plants spend in front of said light isn’t really enough to change anything. In the instance of a large room, there’s usually too much distance from walls where it’s convenient to mount light to your plants. Especially with a weak light, it really needs to be pretty close to have useful par levels.
Most people don’t want to hear it, but I firmly believe that you’ll be better off refraining from trying to improve your lighting $30-$40 at a time. Take that money and stick it in your sock drawer every time you get the urge. Once you have enough experience to know what you’re looking for, you’ll put that money to much better use. Most people (including myself) waste a lot of money when they get started. Everything seems so expensive, and it is. But in most cases there’s a reason why one light is $60 and another light is $300. Or one fan is $20 and another is $100. Not saying you do, or will ever need top notch stuff. But give yourself some time and few grows, and then decide where you feel your grows are lacking. If you think throwing a couple of inexpensive lights on the wall will get you there, then by all means.
Just my opinion, having come from a pieced together cfl system with bulbs, fixtures, and wiring everywhere. Take it for what you want.