[Al Skierkiewicz]

Under R52 in the 2013 Rules you may wire lights through a Spike.
"Each power regulating device may control electrical loads per Table 4-4. Unless otherwise noted, each power regulating device may control one and only one electrical load."
Following Table 4...
"*Multiple low-load, pneumatic solenoid valves or lights may be connected to a single relay module. This would allow one (1) relay module to drive multiple pneumatic actions or multiple lights. No other electrical load can be connected to a relay module used in this manner."
Limit switches have defined maximum current specifications that vary with model and type. It is not possible that we can say in your application that the limit switch can handle the switching current for the LEDs you want to use.