The leaves of the weed absorb much of the ultra violet light so the weed overheat in a second or two.
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The energy consumption is only 1/4 of the equivalent energy used in gas burners for weed control.  
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The uv light does not start fires, as gas burners for weed control.
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Chemicals and herbicides can be harmful if they leak into the groundwater reservoirs.
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If used on railway tracks, a powerful locomotive (5MW supplied to the UV-lamps) can remove weed at a speed above 100 kilometres per hour, if one side on way out and the other side on way back.
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An ordinary very powerful tractor (100HP on PTO) can remove 10,000  m² weed in one hour.
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A special built powerful 1000HP high ground speed vehicle can remove 100,000 m² weed in one hour using light weight aircraft technology for large organic farms and contract weed control companies.
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A special built GPS-computer controlled vehicle can be supplied by electrical power from wind mills for organic farming.
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Special weed control vehicles can be built for vineyards and christmas tree plantations.
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Small weed control units can be made like gas burners - e.g. for gardens and public areas.
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Selective removal of vegetation is possible.  e.g. is straight vertical growing corn only dried by vertical radiated uv-light in the upper top, but weed´s having horizontal leaves are dried all through.