CFLs and LEDs

Other way round IMHO - or it certainly used to be. I have bought several leds (particularly G9s) where it was quite obvious the lumen figure stated on the pack was nowhere near to what the led was actually giving

- often it seemed to be around half (I also checked using my camera's exposure reading vs a new filament bulb. The led required almost double the exposure). CFLs, however, when new, and given a minute to attain full output seemed as bright as their filament equivalent. I also prefer the glare-free light from CFLs compared to that from leds (although the latter are much better in frosted glass).

I can assure you not all LEDs are the same, and some don't live up to their expectations.

I must have been lucky, all of the LED lights that I bought have been far brighter (and better coloured) than CFLs, except for the 4 GU10 that were my first LED purchase - that was in the early days though.

Small format quartz halogen replacements have always been particularly dodgy since they tend to die horribly in the thermally isolated enclosure that was designed to prevent a red hot bulb starting a fire.

LEDs don't make much waste heat but must be able to get rid of what little they do create or it cooks the electrolytic capacitors until they fail.

I agree with that.

The LED I fitted on Lou's standard lamp in 2015 is still working fine.

I pretty much went LED as soon as I could as I was able to get most of the lamps (BC GLS) for free.

Yes, CFLs were around longer. They were still an abomination that I was delighted to see the back of.

Tim

It's a remote phosphor bulb. The phosphor is coated on the three plastic facets on the outer diameter of the bulb, rather than slathered on the tiny blue LEDs inside. This was supposed to be an efficiency optimization, to prevent what is termed "smothering" by some. It was a design by Philips, back when they were Philips and not just a brand name China bought. The bulbs Philips brand vends now, are pretty ordinary (poor power factor, expiry before hitting 10,000 hours, and so on).

The plastic facets, for some reason, have a yellow cast to them. And when comparing the light to a second LED on the kitchen wall, the light from the remote phosphor bulb was yellow (not orange or warm, just plain old banana yellow cast to the light). I can compare other LED bulbs to one another, and see they are attempts at colour temperature shift, and not just an attempt at a filtered colour.

You get used to it after a while.

Paul

None of our LEDs have failed yet, except for a single GLS style one, in an open fitting. The GU10s and MR16s are all still on their originals (bathroom, second toilet and kitchen ones were all put in between 5 and

The four from the first purchase were replaced a year or so later, due to poor output in the first place. All the ones that we have had since then have been fine.

Of course that may not be the experience of others.

The 60 watt Woolworths incandescent bulb that I put in my bathroom in 1991 is still working fine. Only used briefly during hours of darkness.

Philips isnt just a brand name that China bought, most obviously with their Hue system.

Thats bullshit with the Hue bulbs.

No I mean efficacy, which effectively means efficiency. This comes up every time.

Efficacy is whether something is good at what it does, efficiency is specifically how something uses the power provided to it.

Whilst similar, a bulb that consumed 500W to produce 1600 lumens say (100W tungsten equivalent) may be perfectly efficacious at replacing a 100 W tungsten bulb, it wouldn’t be at all efficient. Efficacy is usually applied to a result or outcome, not necessarily the efficiency with which that result is achieved.

It all depends on what aspect of the bulb you’re applying the term to.

efficacious /ef-i-kāˈshəs/ adjective Able to produce the result intended ORIGIN: L efficāx, -ācis, from efficere; see efficient efficāˈciously adverb efficāˈciousness, efficacity /-kasˈi-ti/ or effˈicacy /-kə-si/ noun The power of producing an effect Effectiveness

Tim

Either way I saw from the eFixx youtube channel the other day that the highly efficient "Dubai" Led lamp (previously featured on Big Clive many months ago (and then only available in Dubai) will soon be on sale in the UK - I hate to think what it will cost.

Those are the Phillips ones available in Argos and John Lewis I linked somewhere up there ^^^^^^

hmm, argos broke the search results, try this

or this

Thanks for that, still quite expensive initially then (but payoff if you live long enough). Also when Big Clive did the review they were cool white only (Favoured in Dubai apparently - they like to give interiors a cool feel) seems Argos is 3000K (white) and Lewis's 4000K (cool white)

treat the argos specs with some suspicion, as it says the 60W version is "siri compatible"

The phillips datasheet that argos link to says 4000K