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When the lights are first turned on, it takes several seconds for the bulbs to heat up and start emitting light.  It then takes several more seconds for them to reach full brightness.  As long as the little lights by the light switches have turned from green to red, you should be good.  If all the lights come on except for one, it is likely burnt out.  Please let Steph know.

Finally, if someone has hit the lights on and off a few times trying to figure this out, give the system a few minutes to 'reset' then try again.