1. They were used by flash tubes used in cameras and strobe lights. 2. Light is usually generated by one or more flash tubes or by multiple LEDs. 3. The two charges are typically connected by a'flash tube '. 4. That in turn was removed in 1982 and replaced with a flash tube array. 5. In some flash units with multiple flash tubes , each flash tube can be independently enabled. 6. In some flash units with multiple flash tubes, each flash tube can be independently enabled. 7. Like any flash tube , ionizing the gas in the tube with a high voltage triggers it. 8. This voltage itself is not capable of ionizing the gas in the flash tube , and the tube will not fire. 9. Some flash units have a special UV absorbing glass over the flash tube , which must be removed before the exposure. 10. The second type of solar simulator is the flashed simulator which is qualitatively similar to flash photography and use flash tubes .