Re: @Scatter - look at the numbers, not the technology
The vast majority of domestic LED retrofits give no published figures whatsoever, and many are nameless making them impossible to check.
In testing a lot of domestic are also worse than halogen - there are even capacitor-resistor dropper LED lamps out there!
Aside from that there is the problem of optics - most are tight spotlights so even those that do provide significantly more lumens/Watt often don't actually light the room.
Oddly CRI scores seem to be rarely given - odd, as these are usually well publicised for florry tubes.
The latest approach at the higher end of the quality range is RGB - this is more efficacious and repeatable than Blue + Phosphor, however CRI is misleading for narrowband emitters (it's easy to get a really high or low score despite being mediocre) and CQS is not a ratified standard yet making it very hard to compare.
UV + Phosphor is basically never done, because UV LEDs are low efficacy and rip themselves to pieces in a few thousand hours. (Philips did a near-UV + External phosphor for a while, but it's been discontinued for ages. Shame as it was quite a nice lamp)
Biting the hand that feeds IT
