Gy635 28w low voltage halogen lamp with excellent colour rendering ra100thanks to its xenon technology this halogen light bulb provides enormous reductions in power costs up to 20 and despite its reduced power consumption produces a warm white luminous colour of 3 000 kelvins which is just as good as conventional lamps with a gy635 basethanks to its class b energy efficiency another advantage of this light bulb is not only savings in power costs but also a reduction