Re: @Scatter - look at the numbers, not the technology
Seeing as you insist - two 230V products you can buy now:
Coemar LEDko @ 26deg: under 9 lumens/Watt. (Source: LSI, ignoring power factor losses.)
ETC Source Four (750W Halogen) @ 26deg: 13 lumens/Watt. (The 375W lamp is about 11 lumens/Watt.)
- In reality the LEDko is worse due to power factor which again acts in the halogen's favour.
There are several worse LED fixtures, this is simply the first one I found with published figures that you can check. I've seen LED fixtures that barely reach 5 lumens/watt due to poor optics, diode overheating and (especially) power supply efficiency.
They're generally easy to spot - if it doesn't give both input power and field/beam lumens, it's probably terrible. (Converting lux to to lumens will overestimate as datasheets give peak lux, not average)
Quite a few domestic ones are really terrible, primarily due to cutting too many corners in the LED driver/power supply design. Aside from that, the optics need to match the purpose - I've seen a lot where the optics are so narrow that you can't even use it as a reading light, yet it's sold as room lighting.
That's before you even start considering the quality of the light - the CRI and CQS of most domestic LED are painfully low, even worse than cheap florry.
They can be good, but most aren't and some are truly terrible.
Biting the hand that feeds IT
