Phillips Dubai lamps.

[adam2]

Thanks for the update.

Not certain if these are EXACTLY the same product. The original Dubai lamp claimed 3 watts consumption for a light output "equivalent to a 60 watt incandescent"

These state 4 watts consumption for light output "equivalent to a 60 watt incandescent". 

The claimed "4 watts" is almost certainly reasonably accurate as it is easy to measure independently, might be up to 4.49 watts though since rounding to the nearest whole watt is common practice for general lighting lamps. 4.49 watts is of course more than 10% in excess of the claimed 4 watts.

The claimed light output of 840 lumens is almost certainly true since this can also be measured.  Measuring total light output needs an integrating sphere which most of use do not have, but any university physics department should have one.

"equivalent light to a 60 watt incandescent" is a bit more flexible since actual 60 watt incandescent lamps vary a bit according to voltage, design life, and quality. 

A premium brand, krypton filled, 1000 hour, 120 volt lamp with an actual loading of 63 watts (within tolerance to be sold as "60 watt") will give significantly more light than a cheap, 240 volt, 5,000 hour, argon filled lamp with an actual loading of 57 watts.

840 lumens is a reasonable average for 240 volt 60 watt lamps.

The original 3 watt Dubai lamp only claimed an output of 600 lumens, which met the claimed 200 lumens per watt, but was only an approximate equivalent to a 60 watt incandescent.

Edited March 29, 2022 by adam2