We have two of these hung in strategic locations in the house. They've proved their usefulness in power cuts - not only do we know exactly where they are for immediate use, they also have an led which flashes every few seconds as another indicator.adam2 wrote:They may indeed be impressive, but the specifications must be exaggerated considerably.PowerswitchClive wrote:I would highly recommend these - http://www.DODGY TAX AVOIDERS.co.uk/Varta-4W-LED-Ca ... B004QNW988
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Claimed to be 4 watts and to run on high output for 72 hours from three D cells.
3 D cells in series will be about 3.6 volts on load.
4 watts at 3.6 volts is about 1.1 amps.
D cells cant supply 1.1 amps for more than a few hours, the exact time would vary according to type of cell used but nothing near 72 hours.
Using Eneloop rechargeable batteries means they can be ready for use for years.
I've never measured their light output in hours it seems very good - plenty long enough to sort out other arrangements but certainly nowhere near 72 hours - and the light output is impressive. Their cowls can be removed for even brighter output and the lamp hung upside-down using the built-in hook on the base.
I did not buy them from DODGY TAX AVOIDERS though after all these years I can't remember exactly where I got them; maybe LED Powerhouse in Dublin.
EDIT this post and those following have been split from the lighting preparedness discussion in the preparations form.