Light intensity: 40000~120000 or 40000~150000 Lux each head Light beam with over 3000 reflectors for a focus depth to 700mm. OSRAM halogen bulb up to 1200 hours Digital-control circuit  Each head has got two bulbs, when the main bulb is damaged, the lamp has an automatic switching function to change to the reserve bulb, in order to allow a continuous work.  Single head, double head, triple head and mobile models Optional Back-up battery, CCD camera and LCD screen