Internal analysis of a cheapo Poundland (a UK dollar store) adjustable LED table light.
It's nice that it uses 3 AA cells as opposed to other lights that use AAA cells (which have a third the capacity of AA cells.) It's also nice that it uses 3 cells to ensure the batteries get used relatively efficiently. Some lights use just two cells that only have a fraction of their energy used due to the high forward voltage of the LEDs. (typically 2.6 to 3V)
It also uses a sensible resistor value to give roughly 20mA through each LED with fresh alkaline cells.
It's nice that it uses 3 AA cells as opposed to other lights that use AAA cells (which have a third the capacity of AA cells.) It's also nice that it uses 3 cells to ensure the batteries get used relatively efficiently. Some lights use just two cells that only have a fraction of their energy used due to the high forward voltage of the LEDs. (typically 2.6 to 3V)
It also uses a sensible resistor value to give roughly 20mA through each LED with fresh alkaline cells.
"If children are prone to swallowing batteries, then that's their tough shit". Upvoted!
Getting really redundant. Do you think we believe that you got the white one to check the glow? Get real.
The products stocked seem to vary from shop to shop, but my local branch here has them, albeit that the black and white ones have all sold out and the only colour left on the shelf at the moment is pink!
There is actually an aperture on the casing for an external cable, so USB is quite viable. What would be really nice is to modify it so that it recharges a set of AA NiMh cells from the USB cable. Just off my head that would be a diode from the USB and a 5 to 10 ohm resistor so that the batteries should take a charge whether the LEDs are on or not.
modify it with a usb cable
It's actually quite well made. With rechargeable cells and some new coloured LEDs you could make nice little aimable moodlights for placing round a room at night.