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Collimator light illuminance

Collimator light illuminance

Collimator light illuminance

(OP)
Hey all,
My question concerns the light field for a Bennett x-ray unit with model number HFQ-10000P.  The collimator model is a Bennett D050M.  Performing a radiation safety survey on the unit revealed the light field illuminance to be less than 160 lux measured at an SID of 100cm.  The service engineer indicated that there was a circuit that produced a low illuminance for several seconds and then would come up to full illuminance level after a given time.  He said I was not leaving my photometer in the light field long enough to measure the true illuminance level.  Seems like an unnecessary feature.  Is this the way Bennet intends for the light field to work?  The unit is an hour's drive away so I have not been back to retest, and obviously its a minor issue, but I am curious.

Thanks for your help.

David Englehart

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