There are quite a few variations to these lights, though all following the two (2) bulbs side by side (red and white), side switch, layout.
Details I have observed:
-They are usually white, but I've also seen some which are black.
- Some you can open up via a screw, others with care and a bit of luck.
- Some are made in Japan, some in Indonesia.
- Some the wall plug is removed and flipped around for charging, others it is on a finger slide
- There are variations in dimensions
- Some retail packages are cardboard, others are plastic clamshell type
- Some retail packages have barcodes
- Internally, I've only ever seen a step-down transformer, a few diodes, two batteries, but insides may have been updated (or at least somebody out there did a custom job - see 4th picture below)
I presume there were also variations to accommodate varying wall power standards throughout the markets in which they were available. I have found no common factor between the aforementioned observations and the following model numbers:
NL-221
NL-421
NL-5100
NL-K1D(K)BP
I've culled my info mainly from the internet.
Respectfully,
Flyhalf
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