Mercury Vapor Bulbs vs Fluorescent UVB Bulbs..Thoughts?

I have switched a large portion of my Bearded Dragons to Mercury Vapor Bulbs from 5% or 8% fluorescent bulbs, and they really seem to love the bulbs.. I have the exact same ( with 2 degrees) basking temp, and no other real differences,, But they seem more active, and overall a lot happier( if a reptile can be happy) that with the fluorescents.. The babies show a marked growth improvement with the MV bulbs,, just wondering if anyone else has seen a marked difference in there collection...
just for the record i am using the 100 and 160 watt "capture the sun" bulb from big apple...

We run the Zoo Med Powersuns on our dragons now. There is a vast difference. I think part of it is the intesity of the light (when we were running the Reptisuns we'd add an extra normal fluorescent bulb to add light). I know they have done research on humans and increased productivity at the work place due to more intense light, I'm sure some of that plays over into the reptile world.

Plus when your wall socket hungry it makes things easier

I use a Powersun Mercury Vapor bulb for my Bearded dragon, and I use a heat lamp and flourescent tube for my Rankins dragon. My beardy is clearly doing better than the Rankins, she seems more radiant and colorful with the mercury vapor bulb. I would use one for my Rankins, but she is in a 29 gallon long tank, so it gets way too hot. My Rankins does have some problems though, the vet diagnosed her with some sort of nuerological disorder, her limbs are swollen and she has a hard time getting around, so I need to keep the tank small. I was thinking about adding an ESU super coil lamp, but I havent yet. I do give her lots of supplements and calcium drops too. Her fecals have all come back negative, so I'm thankful for that.