On 21/12/2020 15:07, Andy Burns wrote:
The Natural Philosopher wrote:

Andy Burns wrote:

https://www.tlc-direct.co.uk/Technical/Lighting/L1_Regs/Lumen_Complies.htm
typical LED 806 lumen lamp under 7 watts

I'd say that's a "no"

Actually if you look carefully fluoros are in the 60-70l/

yep

With LEDS in the 50-60l/W range

plenty in the shops over 100l/W including the example I gave from
philips, I notice from replacements that the 806 lumen flavour have
reduced by a fraction of a watt in the last few years

so the fluoros have a slight edge, but its not worth getting excited
about - lighting perception is logarithmic and you wont notice the
difference.
This is interesting from wiki,

21.5 W LED retrofit for T8 fluorescent tube (230 V) 172 lumens/W 25% eff.

Theoretical limit for a white LED with phosphorescence color mixing
260€“300 lumens/W 38.1€“43.9% eff.

Now that IS better than fluoros but only a special fluoro replacement
LED strip was able to reach the first figure. More conventional LEDS
bulbs were 100.

So it seems things are getting better and there is more efficiency to
come, but not *that* much

The low hanging fruit was dumping the 15 lumens per watt incadescents

Its actually a perfect example of the typical Green and wet behind the
ears magic thinking

'but LEDS are getting more efficient and soon they wont take any power
ay all'

versus -

"even at 100% effiency they will only take …™th the power they do now,
and will probably have to be green..."



--
"Corbyn talks about equality, justice, opportunity, health care, peace,
community, compassion, investment, security, housing...."
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"Jeremy Corbyn?"