The ways around it involve a compromise in end quality. This is not something attainable through nutrient or photosynthetic reactions. UVC is too far. The boundary of uva/uvb is what needs to be targeted, the gaussian distribution will take care of the further uvb region. These leds are available. A separate puck could mitigate the damage issues. Keep in mind we (I) are talking about someone who would add uv and regardless of if educated of the risk will accept it indifferent to the source led or gas lamp. Led can be made safer than existing technology.
You are all using eye protection when working in your garden anyway, right?
What is the ANSI Z87.1-2015 definition of UV radiation?
The ANSI Z87.1-2015 standard defines UV radiation as follows:
Ultraviolet Radiation (UV).Electromagnetic energy with wavelengths from
200 to 380 nanometers.
The UV Scale uses a rather complicated mathematical formula, however, for simplicity, it’s divided into two wavelength categories, far and near.
Far-ultraviolet is defined as; Transmittance of optical radiation with wavelengths from 200 to 315 nanometers weighted by its ability to damage the cornea.
Near-ultraviolet is defined as; Transmittance of optical radiation with wavelengths from 315 to 380 nanometers.
UV Filter Transmittance:
- U2: Max Effective Far UV= .1% / Max Near UV= 3.7%
- U2.5: Max Effective Far UV= .1% / Max Near UV= 2.3%
- U3: Max Effective Far UV= .07% / Max Near UV= 1.4%
- U4: Max Effective Far UV= .04% / Max Near UV= .5%
- U5: Max Effective Far UV= .02% / Max Near UV= .2%
- U6: Max Effective Far UV= .01% / Max Near UV= .1%