Energy efficient multi-spectrum screen exposure system

A multi-spectrum screen exposure system for curing printing materials, comprising:

• a multi spectrum light emitting diode illumination light source assembly supported and oriented to direct illumination toward the printing materials, the light emitting diode illumination light source assembly emitting at least some light in the ultraviolet wavelengths and including light emitting diodes emitting ultraviolet light of at least two distinct wavelengths;
• and
• a control unit operably coupled to the light emitting diode illumination light source assembly by which the light emitting diode illumination light source assembly can be operated in a controlled fashion.

A method of curing a printing material, comprising selecting the light emitting diodes such that the first wavelength is in a range from 420 nm to 430 nm and the second wavelength is in a range from 365 nm to 405 nm:

• placing the printing material proximate a multi spectrum light emitting diode illumination light source assembly, for exposure to at least some ultraviolet wavelengths of light;
• and
• exposing the printing material to several wavelengths of ultraviolet light, wherein each of the several wavelengths of light is emitted from at least one light emitting diode supported by the multi spectrum light emitting diode illumination light source assembly and oriented to direct the ultraviolet wavelengths toward the printing materials.