Brightest 'ordinary' LED lamp to go in B22 lampholder

What's the brightest LED lamp one can get for an 'ordinary' lampshade with a B22 lampholder. I've had a look at CPC and the brightest they seem to have are 1521 lumens (why 1521 rather than simply 1500 is anyone's guess). Are these about the brightest commonly available at a reasonable price?

Reply to
Chris Green
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I have a 1521 lumen one from Asda, it's been fine for a few years, unlike a couple of 1055 ones I got from lidaldi. Not noticed anything more powerful on the shelves, but 1521 is enough for me, finally feeling as though it *actually* is the equal of a 100W incandescent

Reply to
Andy Burns

I have a 105w standard BC halogen in one area as a working light. Nice and bright. Would happily buy an LED which matched that. Assuming it radiated the light in all directions, same as the halogen.

Reply to
Dave Plowman (News)

Most LEDs radiate less towards the base, due to the translucent part of the globe generally stopping about half-way, so what style of shade you have determines how much light goes 'backwards'.

Reply to
Andy Burns

The "filament" versions have a similar radiation pattern to a traditional GLS lamp. Only seen those up to about a 75W equivalent though.

Reply to
John Rumm

You can buy 4:1 bulbholder adaptors from China, but they don't meet BS and are rated to 20w per socket max.

NT

Reply to
tabbypurr

it both brighter than most and warmer (which may be good if you want to mimic incandescent). But IIRC it cost over £10.

Reply to
Robin

I've only used the candle version of the LED filaments, where I did want even illumination for a cooker hood, would worry about glare with them in most of my shades, as they all seem to be clear rather than pearl.

Reply to
Andy Burns

As with anything from China on the dodgy market don't you have to derate them by x2 or x4.

Many videos on Youtube show that the power/capacity etc. quoted by many Ebay Chinese sellers are works of fiction.

Reply to
alan_m

That's the brightest I've seen without going to a COB unit which are big and chunky.

Reply to
Tim Watts

There are a few frosted about... slightly lower light output as you might expect...

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Reply to
John Rumm

I'd imagine thisis all down to the frequency of the radiation. Some very high output lighting systems have very bad seeability due to the spectrum where the energy is. LEDs on the other hand do suffer from overheating , so maybe there is a tradoff. another worrying factor to led and to some extent CFLs is the nasty power supplies they have internally shoving crap out over the mains wiring and affecting ordinary radio reception of oled school radios etc. Brian

Reply to
Brian Gaff

In theory if they angled them appropriately this cut off effect would not occur, but then people would complain not all the light was where they wanted it, forgetting that filament bulbs with pearl glass radiated all around as well, wasting power and heat. Brian

Reply to
Brian Gaff

that applies to electronics. I don't know any likely plastic that couldn't handle 20w per socket.

NT

Reply to
tabbypurr

I see that no one has bothered answering your question. The 1521 Lm figure is, I believe, based on a minimum Lumens value required to claim the "100W incandescent equivalency" rating for lamps using alternative technology as the means of light emission such as LED and (I have to assume, current production CFLs). It may be a standard based on the more efficient American 120vac 750 hour rated 100W incandescent filament lamps as per the 806Lm or greater requirement to meet the earlier US based "60W incandescent equivalence" - a Lumens output requirement we can thank the Yanks for since it would have been noticeably lower if based on the UK and European 240/220v 1000 hour 60W incandescent standards.

You ask, "Why not 1500Lm?" and indeed, if that is what you'd like, you can buy such 1500Lm/"100W" LED lamps in either 2700K or 6500K colour temperature flavours with a choice of BC22 or E27 bases for a mere £2.99 in most Home & Bargain stores. They claim a consumption of just 12W but in fact they actually draw 14W, following the trend of the past 5 years or more where *all* such LED lamps have consumed a watt or two more than is claimed on the lamp or its packaging.

The likes of Asda (and I believe, Tescos) tend to charge double for the

1521Lm versions they sell in one off packs. Asda are selling these lamps in packs of two for a mere £7.99, just 99.5 pence per lamp dearer. Somehow, I rather think that price premium is a bit excessive for an extra 21Lm which, even if true, would simply not be a detectable difference in light output. Indeed, manufacturing tolerances could easily account for a Home & Bargain lamp proving to be slightly brighter than one of those 1521Lm lamps bought from Asda.

The limitation on the maximum incandescent wattage equivalent ratings of LED lamps you can buy for GLS use in the home is one of operating temperature. About 5 or 6 years back, the first 81LPW LED lamps came onto the market which allowed the resulting 12W 806lm "60W" to be used with an acceptably low overheating risk in most domestic light fittings (aka pendant lamp holders with a reasonably ventilated lamp shade dangling from a ceiling rose).

More recently (getting on for two years now) the more efficient 125LPW lamps hit the market in the form of these 12W/1500 and 1521lm lamps. Compared to the older 12W/806lm lamps, the newer 12W/1500lm lamps actually run a little cooler (a greater portion of the nominal 12W drawn off the mains supply now leaves the lamp in the form of visible radiation rather than as convected/conducted low grade heat - the heating effect is reduced somewhat).

If you're looking for a LED replacement for your 150W 1000 hour bulbs, you're just going to have to wait another year or three for the next step up in efficiency (probably around the 150LPW mark) towards the 303LPW laboratory samples that had been created in Cree Lighting's labs some 4

1/2 years ago.

Assuming they follow the trend at that time of a ten year lead time for lab sample to product on shop shelves, the 300LPW lamps won't arrive until February 2024 at the earliest, if ever. More likely they'll rest on their laurels once they reach the 200/240 LPW mark since that should allow manufacture of viable drop in "200W incandescent" rated LED replacement lamps.

At the present time, the limit on LED lamp size is set by that of the

125LPW LEDs used in those 12/14W 1500/1521 lm LED lamps currently in the shops right now.
Reply to
Johnny B Good
[lots - snip, thanks for the long and detailed notes]

No, it's not specifically to replace a 150 watt incandescent bulb. We've replaced a (horrible) three lamp central fitting in our lounge which had three ageing CFLs in it. The replacement has just a single B22 (or can be an E27, the holder isn't part of the fitting) so I was just wondering what the brightest easily available lamp would be. I have a 1000 lumen LED in it at the moment and it's reasonably OK so I think a 1500 lumen would be fine. It's not the only/main illumination in a big room.

Reply to
Chris Green

Are you *still* banging the "wait for more efficient LEDs" drum? Surely the manufacturers are only going to drip feed slightly more and slightly more efficient models, never a step change to the lab demo model ....

Reply to
Andy Burns

My post (at least as far as you're concerned) must have fallen into the TL:DNR category for you to miss that very point I'd made.

In any case, the OP (Chris Green) has just confirmed that the 1500lm lamp will suffice his requirement which, if he needs 'instant gratification', can be satisfied by a trip to his nearest Home & Bargain store (or Asda super-store or most any other shop selling a range of LED lamps, including Sainsburys, if he's prepared to pay more than £2.99 for the privilege).

The point about hanging on for another year or three for yet another incremental improvement from 125LPW to 150LPW lamps was addressed to those who've become habituated to the lighting levels they're currently enjoying from the use of the 150W tungsten filament (or 135W halogen equivalent) BC22/E27 lamps hanging off of pendant lamp holders dressed in suitably airy (and possibly expensively fancy) lamp shades dangling from their ceiling roses.

For those people who have no desire to remodel their current lighting setup simply to accommodate the limitations of the current 81 to 125 LPW LED lamp technology with a desire to upgrade their electricity guzzling

150W lamps to better efficiency LED types, the solution to their upgrade problem is simply a matter of time and patience (anywhere from 12 months to maybe as long as three years). After being teased by the prospect of cheap to run lighting promised by the very first CFLs over quarter of a century ago, another year or three to finally replace the last of their incandescent lamp fleet isn't such a long time to wait. Not long to go now but don't hold your breath! :-)
Reply to
Johnny B Good

They frequently do :-)

I noticed today that Tesco have dimmable 1521 lm at £7 each, or three for the price of two.

Reply to
Andy Burns

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