shaped uv light source capable of emitting sufficient light for purposes of sanitizing a room non limiting examples include a low pressure amalgam light source preferably with a solarization reducing coating foreseeably an led uv light source would draw less power and may be optimally suited to battery powered towers 200 the light source 270 preferably includes a variable output transformer 271 see fig7 the variable output transformer 271 controls the output power of the light source 270 as shown in fig7 the base 220 or 221 may also include a fluency sensor 273 this sensor 273 monitors the power output of the light source 270 to ensure that it maintains an output over a threshold which may be either an absolute threshold or a range within a set power output if the light source 270 has a power output that drops below this threshold the sensor 273 sends a signal to the control panel 140 indicating a lower power output status of a given tower 200 or 201 this may indicate a bad bulb or other problem that may result in compromised disinfection if the condition is not repaired also shown in fig7 is a lockout disconnect 275 this is a.