I had photo-dynamic therapy (Using Blue-U and Levulan). I'm wondering if the equipment was faulty or the levulan was inactive?

I've had 3 prior PDT treatments, as post-Mohs therapy. In prior treatment, the light was incredibly hot & bright. With opaque goggles, I needed to have my eyes shut. Yesterday the lights were barely luke warm, The light that shined through the goggle was not extreme. After previous PDT treatments, my face was red, peeling & irritated. It took 7 days for my skin to heel After yesterday's treatment, my skin looked and felt normal. 24 hours post-treatment, my skin still looks & feels normal..

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