So I bought a hydra a couple weeks ago and wanted to post my thoughts on it. I own a couple Vegas so I wanted share the differences I've seen. The vega is a new slim body with a slick mounting rail on top. The hydra is the same body as the sol 4 lenses instead of 8. The vega is soo much brighter than the hydra. I'm not sure if its because of the diffuser lenses on the hydra but they are at least double the brightness. The hydra lenses are frosted looking and I'm pretty sure they are plastic, not very impressive. The top to the hydra fan has this plastic grill that seems very flimsy. The single mounting screw on the hydra really makes me worry that the lit is going to fall into the tank. I love the colors I get out of the hydra, the violet is amazing and makes corals look sweet. I'm not very happy with this light especially since after you buy the controller you are in $500. I am not able to run the vega software and the hydra software on the same controller and that is really lame. If someone knows how to do that let me know. A guy said that I could before I bought the hydra but I think he was full of it. Let me know what you guys think of the hydra! I love Ai and I love the Vega but not the Hydra.