plate 17 of fig2 when the end caps 16 of the same figure are installed referring to fig4 the power conditioning board 30 may be a separate circuit board from the pcba s 20 as noted above in another embodiment the components of the power conditioning board 30 may be surface mounted on the second surface 27 of the pcba 20 see fig2 however the use of separate boards may be advantageous for optimal thermal management and control the power conditioning board 30 may include a surge protector 40 a rectifier 42 a limiter 44 a reducer 48 and a controller 50 the rectifier 42 is electrically connected to the reducer 48 and the leds 24 of the pcbas 20 via a first circuit path 58 the reducer 48 is electrically connected to the leds 24 via a second circuit path 60 the limiter 44 is electrically connected to the leds 24 via a third circuit path 62 additionally the controller 50 is in communication with the reducer 48 and the limiter 44 over respective first and second control channels 63 and 65 e g wireless or hard wired communications busses the controller 50 is configured to control the leds 24 of the pcba s 20 via a method 100 an example of which is described below with reference.