I purchased that light set (shader set) when it was first released and at that time 4.9 wasn't available and I don't think the 4.8 beta was out at the time. I could be wrong about that. I use it in 4.8 on one machine and in 4.9 on another machine. It's not actual lights but shaders that adds emitting light settings to your material zone you want to apply it to. When you render in Iray, you get really great effects when tinkering in the render settings using the bloom filter controls.

As far as being able to use anything new without upgrading, I'm not sure. I think it depends on to many variables right now. I do know that many products being released at this moment may have been made in 4.8 because some products take a while before they 'release' them into the market.

My Store & My Freebies