http://fallout.wikia.com/wiki/That_Lucky_Old_Sun
heres all you need though...New California Republic oriented
McCarran and Las Vegas Strip
Select the first option, "McCarran and Las Vegas Strip", exit the mainframe, take the stairs up and follow your compass to outside. Once outside, go down the spiral stairs and activate the Reflector Control Panel and enjoy the show. After your screen turns normal, go back to Fantastic and listen how he tells you he's going to take most of the credit. This will get you 350 XP and New California Republic reputation. When you exit helios one a NCR personel will give you a emergency two way radio to gain support from the NCR when needed.
Followers of the Apocalypse oriented choices
Fremont and Westside
Select the second option, "Fremont and Westside", as your grid configuration, go outside and activate the Reflector Control Panel to enjoy the show. When you have seen enough, return to Ignacio Rivas to be congratulated on your well made choice. He will tell that hopefully NCR's curiosity in the plant has been satisfied and they won't dig any deeper. You will gain 350 XP, 3 Stimpaks, 2 Doctor's Bags and a moderate amount of Followers of the Apocalypse reputation.
Full region
(See Bugs Below) Select the third option, "Full region", as your grid configuration, go outside and activate the Reflector Control Panel to enjoy the show. When you have seen enough, return to Ignacio Rivas to be congratulated on your very admirable choice. He will tell that hopefully NCR's curiosity in the plant has been satisfied and they won't dig any deeper. You will gain 1 Big Book of Science, 350 XP, 3 Stimpaks, 2 Doctor's Bags and A LOT OF Followers of the Apocalypse reputation (this will get you to the status of Accepted if you haven't had a previous encounter with them).
Archimedes II
Select the fourth option, "Archimedes II", as your grid configuration. A new menu item called "Arm ARCHIMEDES II Plant Defense System" will appear. Here you have 2 options. Both will grant 350 XP and you will be able to use Euclid's C-Finder as a laser designator for an orbital strike.
* If you choose to arm the plant defense system, an alarm will sound warning personnel to get inside. Go outside and activate the Reflector Control Panel to enjoy the show. When you have seen enough, return to Ignacio Rivas. Ignacio won't interact with you and Fantastic will yell at you for killing his employers. You will lose reputation points with the NCR and you will not receive any rewards from Ignacio. But you can be rewarded with spoils of war. After all nearby NCR troops are decimated by ARCHIMEDES, loot their bodies for many Service Rifles, Combat Knives, as well as NCR armor.
* Alternatively, you can choose not to arm the plant defense system and only receive 2 Stimpaks from Ignacio.
Full region (Emergency output level)
Select the fifth option, "Full region (Emergency output level)" as your grid configuration, go outside and activate the Reflector Control Panel to enjoy the show. When you have seen enough, return to Ignacio Rivas who will be disappointed of all the energy wasted, but he will be relieved as the plant can not be used as a weapon anymore. You will gain 350 XP, 3 Stimpaks, 2 Doctor's Bags and Followers of the Apocalypse reputation. However, you will also lose some NCR reputation.
Id have to with full region regular or maybe fire that bitch off just for shits a giggles... gonna do that meow actually