• An incandescent lamp emits a light of all colours, that’s called "continuous spectrum".
• The human eye is especially sensitive to the yellow light (wave length around 550 nm)
• That means a source emitting 10 Watts of yellow light will seem brighter than 10 Watts of blue light, since the eye is a lot more sensitive in the yellow region than in the blue.
  
  

• 100% Interchangeable with a standard halogen lamp.
• ECE R37 Approved for use on roads in Europe
• H1,H3,H4 Quartz Glass construction for ultimate performance.
• Specially developed multi layer coating giving a light to cut through the poor weather conditions. 
• UV Blocked to protect plastic headlamp components.

       Quartz Glass after contact with water

    Hard Glass after contact with water

Which do you think is safer?