We are not really interested in UVC. What we are lookng for is UVA to increase terpene production and UVB to increase THC and other cannabinoids.
The strongest lamps I can find are the ones I am using the t5 48" AgroMax UVA Plus 10,000K lamps and the t5 48" AgroMax Pure UV (75%UVB 25% UVA). You should not be working in the garden with them on - not even for a minute.