Hi,

you should check the absorption spectrum of your photosensitizer and the emission spectrum of your lamp. The absorption/emission is usually not tied to a strictly single wavelength but appears across a specific range with varied intensity. The better overlap there is, the better efficiency you get. See, for instance, the Fig. S1 (attached) from our recent publication's supplementary info for the TPO photoinitiator:

Article 3D printing and post-curing optimization of photopolymerized...

Also, note that the absorption alone is not a guarantee of photoactive properties. You could check it, for instance, by photolysis (attached). You may refer to our other paper for more information.

Article Photoactivity, conversion kinetics, nanoreinforcement, post-...

Petr Lepcio Thanks for the reply, it was very helpful!