CAP-XX Flash Power

Mobile Handset Design Line has CAP-XX article on LED flash power in camera phones. The proposal is to use 0.55F super-capacitors to provide high current pulse for LED flash. There is a table comparing various light sources in different camera-phones vs. super-capacitor options:

Source	Storage Capacitor	Distance (m)	Peak Light Power (lux)	Exposure Time (msecs)	Light Energy (lux.secs)
Xenon, SonyEricsson K750	60μF	1	370,000	<1>	37.0
Xenon, SonyEricsson K800	2 x 14μF	1	203,000	<1>	16.0
Xenon, Gigabyte cell phone	15μF	1	139,000	<1>	6.2
4 x LEDs @ 1A each	0.55F	1	708	17	10.8
				33	21.9
				67	43.7
2 x LEDs @ 1A each	0.55F	1	349	17	5.3
				33	10.9
				67	21.4
Nokia N73 LED Flash	NA	1	20.0	90	1.71
Xenon, SonyEricsson K750	60μF	2	97,000	<1>	9.5
Xenon, SonyEricsson K800	2 x 14μF	2	53,000	<1>	4.2
Xenon, Gigabyte cell phone	15μF	2	36,000	<1>	1.7
4 x LEDs @ 1A each	0.55F	2	175	17	2.7
				33	5.4
				67	10.8
2 x LEDs @ 1A each	0.55F	2	86	17	1.3
				33	2.7
				67	5.3
Nokia N73 LED Flash	NA	2	5.0	90	0.43