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Eveready 2AA Brilliant Beam Torch $4.95 (Was $7.80) @ Bunnings Warehouse
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He is only brilliant when in the black and white
Woolies sell an older version of this torch, or perhaps they haven't updated their website.
On the front of the old packaging, it proudly states "25 lumens bright light" and "35 hour run time":
https://www.woolworths.com.au/shop/productdetails/10286/ever…Although it's somewhat dimmer than most OzBargainers would describe as "brilliant", the long runtime means it is pretty efficient - which I find surprising, given the manufacturer wants you to buy lots of batteries.
No information on whether it will work with Eneloops. As Eneloops have a lower voltage, I expect the torch will be even dimmer with them, if it works with them.
The issue here is that the run time probably won't be longer then a fully regulated driver all though they say 25 hours how bright will the light be. I doubt it has a driver in it. Its probably using a resistor to drop the voltage or it could be running direct drive. You really need a boost driver when using 2 AA in series.
Reading the specs it says its using a Nichia LED it could be high CRI.
It must have a boost circuit, as it has only two batteries, so 3V supply. That's not enough voltage to run a white LED. Torches with resistors as the limiting element have three bstteries or more.
Fully charged alkaline sit at like 1.8v each so more then enough for the LED to run and the LED will output till around 2.5v.
Fully charged alkaline sit at like 1.8v each
I don't know what type of battery you are using, but it isn't alkaline. Maybe non-rechargeable lithium? Alkalines don't go higher than 1.5V under load, here's the datasheet for an Energizer alkaline AA:
http://data.energizer.com/PDFs/E91.pdfHere's the datasheet for the heavy-duty Leclanché cells that come with the torch, again starting at 1.5V:
http://data.energizer.com/PDFs/1215.pdfthe LED will output till around 2.5v
Here's a typical Nichia LED:
http://www.nichia.co.jp/en/product/led_product_data.html?typ…
Click on the "characteristics" tab for the graphs. At 2.8V it draws 1mA - 1/20th of its rated current, and will be achieving 1/20th of its rated light output.From the alkaline battery datasheet, using the "Digital Audio" discharge curve (because it's the closest to 35 hours), the batteries will drop below 2.8V (1.4V per cell) at about 10%-15% into their life. So at that point, the torch would be extremely dim - and that's with no resistor or any form of current regulation.
This torch must have a boost circuit, or it will be below 1 candela output for 85%-90% of the discharge.
@Russ: Mate every alkaline is above 1.5v even with a reasonable current draw we are looking atleast 1.65v+
1.5v is the nominal voltage like a 3.6v lithium charges to 4.2v a good NiMH will charge to 1.5v no issues.
https://lygte-info.dk/review/batteries2012/Panasonic%20Alkal…I have no need to look at a Nichia data sheet i have heaps here and they light up at 2.4v most have a good forward voltage. I also highly doubt this torch is using proper high performance LED like a 219b/c. Its probably got a surface mount LED and draws like 80-100ma of current.
Also ANSI testing states the light only has sustain highest output for 30-120 seconds then it can drop off but this isn't an ANSI claim.
Looks like he wants to return to Melbourne.