LED Journal April 2008.

        http://www.ledjournal.com/eNewsletters/2008/led_newsletter_04-08.htm#1

Portable lantern CFL replacer.

Many interesting products described, but the one that most 
caught my eye (as it were) was the Seoul Semiconductor P7, 
10 Watt 900 Lumen LED 'light bulb replacer' - 1st item in 
'product news'. At 90 lumen/Watt that's above the current 
norm and the 900 lumen output is a tad below the 1000 or so 
lumen output expected from a standard 100 W incandescent 
bulb and well above a 60 W bulb's output.

    http://www.acriche.com/en/product/prd/zpowerLEDp7.asp

900 lumen is max (no surprise)
700 lumen typical.
400 lumen typical at half current (so slightly lower Vf) for 
 > 90 l/W typical at 5 Watts.

With many administrations going mad with plans for 
incandescent replacements this type of product is an ideal 
candidate. At 90 l/W it's efficiency is comfortably above 
the 70 or so l/W expected from better quality CFLs. They 
make the point that the radiation pattern and focusability 
allows an even greater improvement than this over CFLs on 
terms of end user light.

Portable lantern CFL replacer:        In battery powered 
lantern equipment LEDs look ready to replace CFLs especially 
so at reduced Wattage where efficiency > CFL levels applies 
at even typical ratings. Price will be an issue but 
longevity will help.


        Russell McMahon




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