Seeking Insight: Standardizing Phototherapy Device Manufacturing Protocols

I am working on technical standardization for high-performance LED facial masks. As we scale production under ISO 13485, I am curious how other engineers approach spectral output consistency and thermal management in aesthetic hardware.

We have documented our manufacturing R&D process to promote quality benchmarks. I would appreciate any insights on validating LED wavelength precision at scale. How do you ensure long-term stability in your phototherapy hardware?

Our project is listed on SourceForge as: skifirmedicalled