High-tech aluminium, axially centred metal switch, crystal tube reflectors, gold-plated contacts, LED service life of 100, 000 hours, battery life of up to 200 hours. 29 grams of radiant light. Product Details Crystal reflector tube system. High intensity light chip. 24ct gold contacts. Rear on/off switch. Weight: 29 gms. Length: 7.1cm. Batteries included 4 x AG13. LEDs offer these advantages over conventional incandescent bulbs: Incredibly energy efficient. Longer lasting. More co