If you're to use MercuryVapor any of those work but folks tend to like Megaray brand here... Arcadia has a line of them too but you'd need the converter kit from Lightyourreptiles.com if in the US... Wattage will vary depending on where you plan to put the light. You should aim for about 110 in the basking spot for a baby... when they grow, you can bump that up to 120-125. So you probably don't need the maximum wattage off the bat... I would guess likely a 100w but others who regularly use MV bulbs will hopefully chime in here. Helps a lot if you hang the light fixtures from chains not only for safety (tegus can/do jump at lights occasionally), but then you can adjust them to get the perfect distance.
I've seen it around, but what do you consider a baby age from a juvenile? Mine is about two months now and RoseCity recommended 130 for the hottest spot and I do trust his judgement. It does seem hot, but shouldn't they be able to go where they 'feel' is right? Kind of like when we go into the shade if we are too hot?
Nice to hear other peoples' tegus jump at lights, too. My guy seems to be jumping at the screen top already, which has me worried about scarring up his nose. It's not over and over, but it is a 'thing'.
My last question is about hot and cool sides. I just switched his cork platform to a large flat rock I sourced from my backyard to hold heat and be a more quality source. The thing is I have this rock in the center of the enclosure, so the areas around it are cooler. One hide on the right registered at about 80* on top of it, but of course the substrate is cooler below that. Would you recommend moving the rock hot spot to either side and having a hide just off of that and doing it that way?
Sounds really good! They can't resist liquid egg. That and pinkies are Tegu catnip for most. Your humidity sounds good, and the basking sounds perfect. Also - I've seen my male cop an attitude with me during almost every shed. I do help with it too - especially around his ears. I think he knows it, but he's always grumpy-er when a shed is about to happen.