the sun system spectra max is a nice light for for a small op ihave the same one and it runs amazingly cool. I have a smaller 100 w mh puts off way more heat and if you plan on cloning the t5s run about as cool as regular florecents that is what i use mine for primarily and if its your only light your running both spectrums. iwas veg with it two days t5s only third day both t5 and hps. give it a little strecth and run both during flower so from my experiance i would choose the spectra max by sun systems for all above reasons and some probly not mentioned over a no name shady looking hps on e bay. besides i havnt really seen any good deals on ebay the my local store dont have for usually cheaper discount-hydro.com hope that helps:stoned: