Quote:
Originally Posted by nosnoop
Thousands of hours??? Only if they make the LED so dim that it is practically useless.
AAA battery is rated at around 800 to 1200 mAh; i.e. should last 4 to 5 times that of the coin CR 2032 batteries. Sony's cover uses 3 LEDs and the AAA batteries would last 19 hours. So Gecko cover uses 1 instead of 3 LEDs, and its batteries last 1/4 to 1/5 of that of AAA, my estimate is that it should probably last 11 to 15 hours.
|
Yes, your estimation is the same order of magnitude as mine, and there's no way the CR2032 can sustain a bright enough LED for thousands of hours !
Just checked jameco.com and all their lower power white LEDs are in the 20...30mA range, lowering the current only result in VERY dim light.
Only indicator LED (for control panels) require less than 20mA power, and they are REALLY dim. Most efficient brightness/power ratio LEDs are in the 1W...10W range, and these would empty the CR2032 in less than 1 hour !
Another possible advantage of using AAA battery instead of CR2032: you can try to use rechargeable NiMh instead of alkaline (if the 1.2V instead of 1.5V is sufficient, have to check for that).
[Bear 100] Sorry, but LED aren't magic, they need SOME power to produce any reasonable amount of light. And lithium batteries like the CR2032 are among the most toxic waste...