Philips Essential Moto headlights provides the optimal light performance for your everyday use. UV Quartz glass is stronger than hard glass and highly resistant to temperature extremes and vibrations, eliminating the risk of explosion. Philips quartz glass lamps (filament 2 650degree C and glass 800degree C) are able to withstand severe thermal shock. With the capability to withhold increased pressure inside the lamp, UV quartz glass is able to produce more powerful lighting. Application varies per bulb type.