I like to use several different light sources, blue, yellow and red spots are great for large ares but are very bright and should be kept out of peoples' eyes as much as possible. I like to spray flat black on the chromed portion and fixture of the spots and use "blinds" like dead annuals to hide the fixtures (be sure to keep dead vegetation a safe distance from the spots, they get hot).
I use 3 blue spots and about 2 doz Malibu lights in my cemetary, as well as a 2 yellow lamp posts on a dimmer. I tape the connections and bury the wires about 2-3" under the turf. This setup works very well for my size cemetary (90'x30'). We also use blacklights and a few par cans/gels for some of the specialty scenes. Remember: It's not Halloween until someone trips a breaker!