This illumination system is usually based on {TAIL ~ electroluminescent , incandescent or LED devices}, which require special controls, power supplies, {HEAD ~ dimmers} and so on 
This illumination system is usually based on { TAIL ~ electroluminescent , incandescent or LED devices } , which require special controls , power supplies , { HEAD ~ dimmers } and so on
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH