# Solar energy fair - Page 4

Posted by Eeyore on May 14, 2009, 6:21 pm

z wrote:

I see you fail to provide a current measurement. Typical of 'greenies', they
haven't a clue what they're talking about. They just like advertising talk.

90 secs / hour is 2.5% of the battery capacity ( simple arithmetic ) . No, I
can't for one second believe that. Let's say the laptop consumes ~ 100W, the
LED light would be only 2.5W.

Graham

Posted by z on May 14, 2009, 6:51 pm

I don't have the ability to measure the amperage of this little USB
light.  And i'm not a 'greenie' by choice.  I'd have electricity from the
grid if I could in a heart beat.

It would be a lot less than that.  The input voltage is 19v at 3.42 amps
on this laptop.  When running under batteries w/power saving on it would
be much less than 64 watts total.

the max you can push through USB is 500 mA @ 5 volts which = 2.5 watts
right?

This light has a switch which either turns on 8 LEDs or 4 LEDs, so you
could expect that using the 4 LED setting the max it could be using would
be 1.25 watts.  I could tear it apart and see just how much juice each
one of those LEDs require but I don't think i'll bother. I seriously
doubt its maxing out the USB amperage but anyway here is a real world
test from a review:

http://www.edgereview.com/reviews.cfm?Category=computing&ID0&Part=2

"Kensington says the FlyLight uses approximately 90 secs per hour of
battery to run the FlyLight. I decided to give this a test and I charged
my battery full and left my computer alone with the screen saver turned
off, with no FlyLight plugged in. Exactly 3 hrs 36 mins and 29 secs later
the computer went into Sleep mode. I again charged the battery, plugged
in the FlyLight, and left the Laptop alone. Exactly 3 hrs 30 mins and 54
secs later the computer went into Sleep mode. That is only a different of
5 minutes and 30 seconds for a little over 3 1/2 hours of use. Almost
right on with their suggested amount of battery life being used. In my
opinion the light is worth the 5 minutes and 30 seconds of battery life
that I will lose for the added convenience of a portable light. "

So compared to a CFL or most other household lighting its good enough to
sit in the dark and see your keyboard.

-z

Posted by Jim Wilkins on May 14, 2009, 10:13 pm

Look at the properties of the USB hubs in 'Device Manager'.

jsw

Posted by Eeyore on May 14, 2009, 11:17 am

Michael B wrote:

Most rooms aren't at night.

Graham

Posted by sspence on May 14, 2009, 12:44 pm
wrote:

Try making sense Graham. I've never needed auxiliary lighting when
using my laptop, day or night. If I did, I'd fire up my 15 watt CF
someone else, you ought to walk the talk. Refresh my memory, why
exactly are you on this group? I'm here because i actually live off
grid and use the technologies I promote.

Steve Spence
http://www.green-trust.org

•
• Subject
• Author
• Date
 Re: Solar energy fair wmbjkREMOVE 05-13-2009
 Re: Solar energy fair wmbjkREMOVE 05-13-2009
 Re: Solar energy fair Michael B 05-14-2009
 Re: Solar energy fair Lord Gow333, Di... 05-14-2009
 Re: Solar energy fair Ulysses 05-14-2009
 Re: Solar energy fair Lord Gow333, Di... 05-15-2009
 Re: Solar energy fair wmbjkREMOVE 05-14-2009
 Re: Solar energy fair Jim Wilkins 05-14-2009
 Re: Solar energy fair sspence 05-14-2009
 Re: Solar energy fair wmbjkREMOVE 05-18-2009
 Re: Solar energy fair wmbjkREMOVE 05-19-2009
 Re: Solar energy fair wmbjkREMOVE 05-19-2009
 Re: Solar energy fair wmbjkREMOVE 05-20-2009
 Re: Solar energy fair wmbjkREMOVE 05-21-2009
 Re: Solar energy fair wmbjkREMOVE 05-22-2009
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 Re: Solar energy fair wmbjkREMOVE 05-26-2009
 Re: Solar energy fair wmbjkREMOVE 05-27-2009
 Re: Solar energy fair wmbjkREMOVE 05-27-2009
 Re: Solar energy fair wmbjkREMOVE 05-27-2009
 Re: Solar energy fair wmbjkREMOVE 05-27-2009
 Re: Solar energy fair wmbjkREMOVE 05-14-2009
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 Re: Solar energy fair wmbjkREMOVE 05-16-2009
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 Re: Solar energy fair wmbjkREMOVE 05-17-2009
 Re: Solar energy fair wmbjkREMOVE 05-17-2009
 Re: Solar energy fair wmbjkREMOVE 05-18-2009
 Re: Solar energy fair wmbjkREMOVE 05-15-2009
 Re: Solar energy fair Jim Wilkins 05-14-2009
 Re: Solar energy fair sspence 05-15-2009
 Re: Solar energy fair wmbjkREMOVE 05-15-2009