The UV420 plasma grow-light offers a leap forward for grow-lighting. The 420 Watt unit delivers high levels of UV-B, UV-A and blue and can be adjusted to optimise output to suit a growing cycle. The vital UV-A/UV-B is absorbed by greenhouse glass and is absent from PAR lights. The UV420 delivers high energy 'blue-end' photons to complement the abundance of low energy ‘red-end’ photons from PAR lights.