Can you tell me how to test the intensity of lamp in DLP NIRscan Nano device?
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You could use a Photometer to measure the lamps intensity. This optical engine wasn't designed or built by TI, so I cannot comment on what the baseline brightness was when the EVM was new. You could also purchase a new lamp from the link I shared above ( looks like minimum order is 5 lamps for $155)
May I ask why you are concerned about attenuation of the lamps intensity? have you seen unexpected or inaccurate results in your measurements?
You should also note that the life of the lamp is ~18000 Hrs.
here is a link the their product catologue https://www.intl-lighttech.com/sites/default/files/ilt_sources_catalog.pdf