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Barmy, the lights only promote grass growth whilst the soil temperature is above 7 degrees C. The time when the pitch damage occurs is during the three or four months when the grass can't grow due to temperature, not light. UV lighting is useful largely only for clubs with undersoil heating able to maintain the requisite temperature.
No Extra Heat Required: UV light does not intrinsically require heat to function. Most modern UV LEDs are highly energy-efficient and generate very little heat .