Depending on the types of corals your quarantining and for how long. Personally, if your talking acroporas, the big expensive will be suitable light. The PC IMO is just not going to cut it especially if a redbug treatment can take 3 full weeks, flatworms possibily even more. At minimum, I would think 150W DE setup or T5s. Ideally would want the same fixture as your show tank.
Since my acropora did pretty well under T5s, I am planning to reuse them for my quarantine setup once I get the MH
SPS tank up and running. In my case where the T5s are 36" long my
quarantine tank will be a long skinny shallow arcylic tank (36L X 8W X 8H ) and heat from the T5s shouldn't be an issue.....Downside to not using the same fixture as my show tank will be multiple light acclimation required so I will have to see how that goes.....