Hey man, the Odyssea fixtures in general have had a bad rap for a long time now.. I myself have gone through a bunch of lighting options for my 36G bow tank.....
I first tried a coralife Power Compact fixture..... no good... I then tried a fishneedit 24" 4 bulb fixture.. My tank is too high, but for long tanks would be a great fixture. I still have it in case you want to pick it up from me, cheaper than the Odyssea... only used it for 2 weeks.
I now am the proud owner of a BoostLED 135W Mu Series fixture...... the up front cost is a little of an investment, but it ROCKS!
The knocks on these cheaper manufacturers, fishneedit, Odyssea, etc are the bulbs they come with are absolute crap. Replace those bulbs right away or you will likely be growing some nice algae with them

The spectrums suck. The ballasts are under-driven... the Odyssea MH fixtures are certainly underpowered, as well as shitty bulbs.
For my 6G Fluval Edge reef, I have decided to also invest in the nanutuners LED fixture... Certainly not cheap, but can keep ANYTHING i want in that bad boy, the lights are intense!!
PM me if you are interested in the fishneedit it fixture.. I was going to send it back, but if someone locally wants it, would be cool.
I personally like the experience with fishneedit, Simon is a really good guy, answers quickly, ships quickly, so would recommend them. HTH you.