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Posted by residualselfimage1999 on May 16, 2009, 2:50 am
 
incandescent 60w bulb vs compact flourescent bulb vs LED bulb
Online Video 6:46 minutes
http://www.veoh.com/browse/videos/#watch%3Dv18473803QP3keYJ6

GeoBulb - LED Lightbulb = 99.99/bulb
http://www.metaefficient.com/leds/geobulb-a-led-bulb-that-replaces-a-60w-bulb.html
http://www.ccrane.com/lights/led-light-bulbs/geobulb-led-light-bulb.aspx

EarthLED ZetaLux - LED lightbulb = 69.99/bulb
http://www.earthled.com/zetalux-led-light-bulb.html?gclid=COPQy-Dov5oCFQOcFQodKQaTqw

commentary
LED technology is improving but it is still expensive



Posted by Eeyore on May 16, 2009, 3:23 pm
 


residualselfimage1999@gmail.com wrote:


There's a mistake in there btw. AFAICS they didn't use a 'true RMS' meter to
measure
current. This will tend to make the current usage of the CFL and LED bulbs look
lower
than it really is.



http://www.metaefficient.com/leds/geobulb-a-led-bulb-that-replaces-a-60w-bulb.html

http://www.earthled.com/zetalux-led-light-bulb.html?gclid=COPQy-Dov5oCFQOcFQodKQaTqw

All bulbs should be required to have a lumens and watts rating. That's the only
way to
make a genuine comparison rather than believing manufacturers' claims.

Graham



Posted by residualselfimage1999 on May 17, 2009, 2:19 pm
 wrote:

agreed.

Given that LED lumen levels can drop if the LEDs overheat
 - LED lumen output charts would be nice too.

But can you believe the price the LED light bulb? :-0
Its Pentagon Pricing!  9_6





Posted by Eeyore on May 17, 2009, 8:24 pm
 

residualselfimage1999@gmail.com wrote:


measure

look lower

only way to

Well, the efficiency drops with heat by quite some degree, so at maximum output
the
efficiency may be only 60% of the optimum level but the sales blurb rarely
mentions that.

Also the most efficient white LEDS are the ones with the highest colour
temperature which
isn't pleasant for home illumiation.



Individual LED chips are getting a lot better. Osram recently announced some new
ones but of
course I've lost the link !

I found one, not the one I was looking for but claiming 50 lumens / W.
http://catalog.osram-os.com/catalogue/catalogue.do?act=showBookmark&favOid