UVC bulbs have shatterproof sleeves to prevent glass and gases from escaping if a bulb is brokenBulbs emit UVC radiation at a wavelength of 254nm which is proven to be effective at eliminating bacteriaviruses and fungiBulbs are arranged to provide complete 360 degrees of irradiance and the highly reflective polished aluminum chamber maximizes effectiveness of the UVC bulbsSanitizes in just one minutereducing viruses and bacteria.Bulbs are easy to replace by educators and are rated for 11000 hours**