In the technical manual it was mentioned that if the illumination drops to less that 75% the red indicator will light on. The 75% is based on what value in terms of micro watt?
On the charts of the irradiation, you can see that the irradiation depends largely on the distance between lamp and surface. The 75% mean: 75% of the irradiance of a new blue light. So, if the hospital wants to measure this, they should first find out what their 100% is (depending on the age of the tube, there may be some variances). This should be measured at a given distance, i.e. at 25cm in the “maximum value” position. Then 75% of this can be calculated.
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