Who is arguing? Oceana has a good point that our fishtank should look it's best so we should get the best light for it. This is a topic where we are deciding what is the most efficient lighting for a fishtank and informing newbies on their lighting decisions. All I want is for people to post numbers or results of their fishtanks, "I don't care about waaa waaaa, my Daddy is smarter then your Daddy comments.". You can start another post in THE AQUARIM topic labeled "My Daddy rules, and I love him."
1journeyman, watts is watts, if you clarify that horsepower is horsepower we can discuss that as a metaphor for our hobby. if you fill up a tank of gas in a Full size truck (MH since it's the most watt consuming light) and a fill up in a motorcycle (T5 since it's the most efficient thing currently), what will cost more and still get you from A to B? To get back to topic, i've been running T5s for 6 years, in those 6 years i've kept acros, zoas, leathers, montis, acans, rics, brains (I don't keep cheap brown stuff), I've only had a ritteri anenome and a goniopora die on me.