I was hoping this lamp was going to have similar circuitry to the Dubai lamp, which is not sold in other countries, and while it does have the same concept of under-run LED filaments for long life and higher efficiency, it uses fairly standard circuitry inside.

The one interesting feature of the circuitry, and also the bit that took me longest to reverse engineer because it caught me off-guard, is a novel design twist that reduces the voltage across the chip. The inclusion of transient clipping resistors and filtering should also add to the reliability.
It's been pointed out that the circuit configuration will also increase the efficiency slightly, as the chip current will contribute to the LED current.

I'm surprised that a linear regulator wasn't used as in many other lamps due to the simplicity. It's possible that this lamp has been in the design stages for a while and used buck regulator circuitry as a result of that. The choice of 100V filaments is possibly to cater for 120V and 230V options. Tuning filaments for linear regulators is a bit more complex than the multi LED arrays.

The high cost of this lamp (I paid £12 at John Lewis in the UK) is purely for the life/efficiency features. In the right location it will pay its way by reducing power and maintenance costs. Especially where architects/designers have put light fittings in locations that make servicing them difficult or hazardous.
In the home it could be useful in areas like halls and stairways where the lights are used a lot during the day.

The 3000K white has a slight nudge in the green area of the spectrum, possibly to increase perceived intensity by giving it a peak in the area of human eye sensitivity. I'd guess that aside from the efficiency gain of under running the LEDs, a fair amount of engineering has probably gone into the phosphor choices too.

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