Lights are currently used for a 2ft cube, seated on the tank, edge to edge. If elevated, I believe can cover a 2.5ft tank, MAYBE a 3ft. Currently for my 2 footer, max settings are 70% white and 90% blues. Ramped up/down accordingly.
Lights are controllable. I have a few pieces of aluminum bars which I can let go all at $10 for you to DIY a hanging kit if you want.
Collection and viewing at Clementi.