On Thu, 27 Mar 2014 01:45:28 -0700 (PDT), firstname.lastname@example.org wrote:
That rather neatly sums it up. Mentioning the phrase "niche product"
reminds me that I found one for a 5 watt LED lamp I bought in Asda for
a fiver about a year ago. The niche in question being the foot of the
basement steps where the area being lit is quite small and the cool
temperature reduces thermal stress on the lamp (it's plugged into a
ceiling mounted batten socket).
The half second or so delay between switch on and instant brightness
is a welcome change from the 11W CFL previously residing in the
I'd bought it because it was cheaper than the 3.5 and 4 watt
alternatives next to it on the shelf and thought it was 'worth a
punt'. I first tried it out as a replacement to the 11W double helix
CFL in the bedroom wall light fixture over the bed head.
The glass tulip shade wasn't ventillated and I rather thought this
was detrimental to the lamp so I then transplanted it to a desk lamp
where it seemed to be adequate and in no danger of overheating. Even
here, I decided that another 11W CFL would be a better match before
finally discovering its ultimate niche.
I saw those 10W LEDs in Aldi last Sunday and wasn't impressed at the
1 penny shy of ten quid price tag and, for all the reasons you gave
which so neatly sums it all up, decided against making a purchase. I
might have been tempted if it had been more sensibly priced (imo, a
fiver would have been enough temptation).
For laughs I've replaced three 11W CFL bulbs in the same light fitting,
with 6W LED golf ball - purchased from ASDA, they are currently selling
three for £15. Light output is a more pleasing white rather than yellow
- also the round bulb suits the shades rather better than the CFL sticks.
6 Watt LED GLS BC Bulb - £8 each, deal 3 for £15.
Note these bulbs are 39W incandescent equivalents (420 lumens) they
won't light up a whole room by themselves. But three is ample.
Once upon a time for me that light fitting drew 120W of power daily from
18:00 to midnight. Now it's down to 18W. :)
ledhut.co.uk have some good ones - I've been trying a few and have been
Quidco cashback available, and often a 25% code around (there is today for
example). Next day delivery with DPD (so it actually arrives) is only 2.99
as well which seems perfectly fair.
If you get the discounts and order at the right time, they are becoming
quite cost effective now. I've been impressed at the quality (both of the
lamp, and the light :-) ) so far... Can't comment on the life though yet :)
They do offer a 5 yr warranty although you have to post them back a form
for that IIRC.
No connection beyond being a happy customer
Here's the latest from Cree:
a staggering 303Lm per watt efficacy. That's remarkably close to what
Philips referred to as a theoretical maximum of 390Lm/W for a lamp
with a CRI >80 with sufficient red content (the 683Lm/W maximum is in
relation to a single pure green light of 555nm wavelength).
Now all we have to do is sit tight until all the rubbish stock has
been cleared out of the distribution channel and the current lab
developments to be worked up into a marketable product. Cree are
suggesting a development to market timetable of 18 to 24 months.
Assuming a properly implemented lamp design, even a mere 200Lm/W lamp
would be worth considering (twice as good as a fluorescent tube) as
long as they cost no more than the 4 or 5 CFLs required to last the
50,000 hour life rating of the replacement LED lamp.
If the lamp manufacturers offer warranty periods to match the lamp
life claims (3 to 6 years), they'll expand the pool of 'early
adopters' prepared to accept a premium pricing of the product which
will speed up the process of ramping up to mass volume production
levels and an ensuing fall in pricing.
The CFL could well become a museum curiousity by the end of the
decade given the surprisingly rapid development in LED technology over
the past 8 years.
On Wednesday, March 26, 2014 at 12:27:22 PM UTC, email@example.com wrot
eye was a ES rated at 1050lm, staing 75W equivalent. Also a BC 850lm. Plent
y of dimmer ones too. These are the first usefully bright ones I've found.
Will try them out later and report back.
I now have to report that one of the lamps has failed entirely. So that's j
ust 16 months of life, maybe 2 hours a day = 1000 hours. Boo.
It was fitted in an upright position in a standard lamp, socket downwards,
which I understand is the best way to keep the lamp cool. There was plenty
of clearance above too.
On Wed, 5 Aug 2015 18:16:45 +0100, dennis@home wrote:
That's why we have two set of curtains on most windows, to keep the
truely dark dark out. Lights just can't hack the truely dark and just
glimmer against it.
When it's truely dark up here it's unnerving, "have I gone blind"?
On Wed, 5 Aug 2015 06:29:08 -0700 (PDT), firstname.lastname@example.org
Had a 350 lm 4.8W Aldi fail the other evening but this one is on 24/7
and the quoted life of 20,000 hrs is about 2 years 3 months. I'm not
sure when it went into service, for some reason I didn't write the in
service date on it.
This bulb was in an enclosed ceiling fitting and currently the
overnight voltage is around 255, better than the 258+ it got to the
first night after they started line work and rerouted the 33 kV feed
to the local substation. We did drop below 253 (the upper limit) for
a few night but it's gone back up again.
You may remember one of mine failed entirely, I got a refund, another
flickered a couple of times the other evening, it may have been mains
disturbance as it was dark/thundery weather nearby ... but I'm keeping
an eye on it ...
My second one managed more than that, lets say 18 months at 6 hours/day,
3000+ hours, nothing like the 25,000 headline figure on the packaging.
I contacted ALDI by email, their response was 12 month warranty, tough.
I didn't want to faff about convincing them to refund/replace, so I took
it apart, hoping I might find an obviously failed capacitor in an easily
accessible location, no such luck.
Fairly normal layout, all potted in soft silicone, input resistors to
mains rectifier to bead-type smoothing caps, then there was a wirewound
resistor feeding into the ICs/transistor chopper section, feeding small
transformer and output smoothing caps.
The wirewound resistor was burnt to a crisp (the lamp didn't fail
spectacularly just flickered then faded away) all the surrounding SMDs
looked like their solder was cooked and discoloured, one surface
resistor had melted away from the PCB, so looks like long term overheating.
Seems like the guts of the 13W are pushed too hard.
Indeed, sod lidaldi for LEDs in future, the LEDhut ones of similar age
(fewer hours and lower wattage) are still going OK, but I'll try some
with a multi-year warranty, what were those recommended by Adam,
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