The HID Lamp gentle sources (hid bulbs) offer substantially greater luminance and luminous flux than halogen bulbs - about 3000 lumens and 90 mcd/m2 versus 1400 lumens and 30 mcd/m2. If the higher-output HID gentle source is used in a well-engineeredheadlamp optic, the driver gets more usable gentle. Studies have demonstrated drivers react quicker and much more accurately to roadway obstacles with good HID headlamps instead of halogen ones. Hence, good HID headlamps contribute to driving security. The contrary argument is that HID bulb , bulb lamps  can negatively impact the vision of oncoming visitors because of their high depth and "flashing" impact due towards the rapid transition between low and high illumination within the field of illumination, thus growing the risk of a head-on collision between the HID-enabled vehicle and a blinded oncoming driver.