I use tretinion cream (.05) at night and also use an LED therapy mask. My question is, which should I do first?

I was wondering if I put the tretinion on first (I wait 20-30 after washing, this seemed to completely stop the peeling & dryness) if it would penetrate better? Or would it just get in the way and not give me the full benefits of the LEDs? My usual routine is, wash & tone face, apply serum, do the LED therapy while waiting the 20-30 min between washing and tretinion and for serum to soak in, and then apply tretinion. So would it be bad if I did the LED therapy AFTER the tretinion?

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