Working Speed

Only a few percentage of UV light are reflected, when hitting a thin green leaf. Only a little UVA Light goes through and are lost into ground.
UV-C Light	Penetrates only the thin top surface - converts to heat inside leaf and DNA damage inside cells.
UV-B Light	Penetrates most of the thin leaf - converts to heat inside leaf and DNA damage inside cells.
UV-A Light	Penetrates a thin leaf - a major part converts to heat inside leaf
The small amount of water in a thin leaf is heated up very efficient from inside by a beam of UV Light. It is why UV Weed Control equipment can be used at high speed and very high speed if the UV beam is generated by equipment able to supply very high power. At very high power, it takes only a flash of UV light to increase the temperature inside a thin leaf to the boiling point.