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Sylvania 8w LED (40 watt equivalent) light bulb - Page 2

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Posted by danny burstein on October 30, 2010, 7:53 pm
 



the

True rnough. but these ones are labled/marketed as such...


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Knowledge may be power, but communications is the key
             dannyb@panix.com
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Posted by Josepi on October 31, 2010, 8:12 pm
 
...and when you find a dimmable one it will not be on sale (yet) nd it will
be about $0 **sigh**



True rnough. but these ones are labled/marketed as such...



Don't automatically assume that every LED bulb is dimmable.  As always, read
the
label before you invest.




I placed it in one of the five holders standing out from
a ceiling fan. The lamps are controlled by a dimmer
switch on the wall.



Posted by danny burstein on October 31, 2010, 9:58 pm
 

the $9 "40 watt equivalent" from Home Depot is, indeed,
marketed as being dimmable, and I'm using it as such.

In case my earlier post didn't get to your viewer,
the lamp, as per the Mark One Eyeball, seems more
like a 35 watter (and the direct lumen listing
comparison agrees).

However, in a dimmable circuit, namely when it's alongide
a bunch of others attached to a ceiling fixture, it seems
just as bright at "full", and a bit brighter as I dialed
the setting down.

My guess [tm] is that at "full", the dimmer only lets
through 95 or so percent, and that the LED handled
that number better than the incadescents did. And
similarly, as I dialed it down, the LED kept the
advantage increasing...

- no connection with HD or any of hte other vendors
  except as a reasonably satisfied customer.



--
_____________________________________________________
Knowledge may be power, but communications is the key
             dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]

Posted by danny burstein on October 30, 2010, 9:29 pm
 [correcting an earlier typo I made]



Home Depot's got a house brand "40 watt" equivalent LED lamp
now in hte stores nearby for nineteen somethin dollars.

I just picked one up.

Using the Mark One Eyeball for measurement, it's
a tad dimmer than a 40 watt incandescent. I don't
have the boxes with me, but when I looked in the
store the numbers were something like 3,500 lumens
for the incandescent, 3,200 for the LED.

(I originally typoed that number as "a 30 watt incand.
  in other words, the "40" watt equiv LED put out just
  a bit less than the 40's, and not the miserable
  output you'd get from less than 30's...)

I emphasize NOT to rely on my memory here, but the
roughly ten percent difference was on the labels.

Anyway, it's the standard incandescent bulb form,
and...

While it's a tad less bright when in a regular base, I
found a perfect use for it.

I placed it in one of the five holders standing out from
a ceiling fan. The lamps are controlled by a dimmer
switch on the wall.

In this application, the LED was (again, per Mark One Eyeball)
every bit as bright as the incandescents. And when dialing
downward, it dimmed fine and was actually a bit brighter
at the lower settings than the incandescents.

My guess [tm] is that the wall switch, even at max, cuts
out a bit of the voltage/current/waveform, so that the
actual passthrough is, say, 95 percent. The LED gives
out 95 percent of the "full" light, while the incandescents
give out 90 percent...

Anyway, for many uses this is a good actor. At the equivalent
of 35 watts, it's fine for many locations. And since the LED
comes "right up" and is much _less_ sensitive to cold temperatures,
it would be good for outdoor use with a motion detecter or
a garage type on/off. The long life would be an extra plus...

info about the LED lamp:

http://multivu.prnewswire.com/mnr/homedepot/45705/

--
_____________________________________________________
Knowledge may be power, but communications is the key
             dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]

Posted by Gordon on October 31, 2010, 12:02 am
 

Yea, I was down at the Home Despot last week to get some
closet pole.  I wandered around and noted that the LED
bulbs being sold.  They are a bit spendy still. But, so
were CFLs when they first came out. They also will
probably need some color balancing (if CFLs are any
guide).  Dispite all that, I am happy to see the LED
bulbs beginning to enter the mainstream market. They
don't contain mercury, like CFLs and are all 'round
better for the environment.

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