Verschiedenste Artikel von Karl Zeilhofer

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====== Osram Nightlux ======
3.12.2014\\
{{http://ecx.images-amazon.com/images/I/71CeYMuK1TL._SL1287_.jpg?direct&300|}}

This battery powered LED-light is really useful. \\
We use it in an old house, where appropriate light switches are rare. E.g. the entry hall with 6 doors in total has only one light switch. 

Now i have 6 pieces of them installed and I have to change the batteries (3 pieces Sanyo Eneloop AAA, 750mAh) in one of the devices nearly every day. So I measured the current consumption:

===== Measurements =====
Light on: 48...50mA @ 3x1.40V\\
Light off, approximation sensor active (in dark environment): 300uA \\
Light off, approximation sensor inactive (in bright environment): 60uA

===== Battery life estimations =====
When we assume a dark installation site, where the AS is active all the time, the batteries should last for about 104 days. When the Light is on 1 hour per day, it should still last 13 days. 
This seems to be quite realistic. I think, in the average, my devices last for about 10-14 days. 

===== Deep discharging =====
Sadly, no deep discharge protection is implemented. The Light gets weak, when one of the batteries goes below 0.9V, since the impedance of this cell increses. \\
Once I measured nearly 0V of one NiMH cell, wich is not good. Hopefully the cell recovers. For now, I'm measuring every cell voltage before replacing it with freshly charged ones. 

{{tag>english product led battery technical}}

Verschiedenste Artikel von Karl Zeilhofer

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