I'm in the process of changing the lighting in my 24G nanocube right now. I think that the best options for retrofitting extra lighting, without spending a FORTUNE, can be found at nanotuners.com and illuming.com. There are multiple PC and MH fixtures and upgrades that you can choose from. I'm also considering the K-2 Viper from JBJ as a nice, simple MH upgrade. Good luck with it.