IMO/IME
I am going to go out on a limb here
. You can keep SPS under just about any lighting even Normal output bulbs(I've done it). I'm not necessarily saying this is better for intense colors. The point is healthy, somewhat colorful SPS can be kept under less lighting. This is one of the biggest misconceptions in the SPS reefing. The key is to keep your nutrient levels down.
Lighting is not the only factor to consider
Ask yourself this. Why don't my corals look like another guys corals with the same lighting? Because there are other more important variables such as coral selection, acclimation, nutrient level, water clarity, and coral placement. Don't accept the answer "every tank is different". The truth is they're all the same....well, not literally. They're the same in a sense that our animals will react the same given specific situations and environments.
Keeping SPS is easy. Keeping SPS with a nice stock of fish isn't. IME of keeping SPS over the last 8 years, they can handle huge swings in temp, alk, calcium, and PH and still be healthy + alive (maybe a little stressed) If you put them in a "dirty" tank they RTN overnight. A dirty tank for SPS would be considered many of the successful mixed reefs we have on the boards here. If you choose to keep SPS + some fish you will need a really good skimmer, large frequent water changes, a good phosphate remover, or you can resort to one of the uber reefing systems like zeo or prodibo etc...You'll likely kill quite a few corals learning how to correctly dose the last option.
That stupid saying "have your cake and eat to" applies here. You're not having a tank full of fish and colorful acros unless you are really prepared to work for it, and it does become work. My advice to newer reefers interested in SPS is to be prepared in the necessary maintenance required to keep a nice SPS tank with fish. Have the right equipment.
If you are really serious about SPS and find yourself with limited funds for good equipment, add no fish or only 1 or 2 max. Feed little
The worst thing you could do is have a lot of fish, SPS, and poor equipment. SPS are "hard" to keep this way. In this case, you're better off keeping a mixed reef. Nothing looks worse than a tank of brown acros.