well if that light has been used for years without any negative effect that is fine but I doubt they have had much benefit either.
In the desciption it says it gives out the wrong light spectrum for growing plants and should be used for 10-30 seconds to achieve UV-A curing.
It's what my dentist used to cure my denture glue.
I would bet money that if you replaced your 250 watt curing bulb with bulb designed for growing plants you could save electricity and get more growth.
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