The secondary filament 18 and {HEAD ~ the tertiary filament} 20 are preferably lower wattage, up to {TAIL ~ a maximum} of 15 watts, in order to keep the filaments 18 and 20 from overheating and damaging the colored sleeves 22 
The secondary filament 18 and { HEAD ~ the tertiary filament } 20 are preferably lower wattage , up to { TAIL ~ a maximum } of 15 watts , in order to keep the filaments 18 and 20 from overheating and damaging the colored sleeves 22
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH