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1156 bulb versus CF bulb - Page 4

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Posted by SolarFlaire on January 16, 2006, 4:44 am
 


OK This is a completely different bulb than I had seen
at Home Depot.

Sounds hard to believe the inverter would be that
efficient.

Thanx for the info. Next time I am at HD I will look
again.


a switching walwart.
http://www.bulbconnection.com/ViewItem/bcrw/itmid/985/oc/F8T5%2FD/item.html


Posted by Tim Thomson on January 15, 2006, 10:34 pm
 


Steve Spence wrote:


Why would I when for 2.50 cad I can buy a 120 volt CF? Besides I allready
have a couple of the el cheapo inverters and besdides my Home Depot
doesnt stock the 12 volt ones.



Posted by JoeSP on January 15, 2006, 7:23 pm
 



The 1156 incandescent draws about 2.1 amps at 12.8V 'W, and provides about
400 lumens for an efficiency of 15 lumens per watt.

An F8T5/CW Fluorescent draws about 0.8 amps at 12.8V .2W, and provides
about 400 lumens for an efficiency of 39 lumens per watt. That's over twice
the efficiency of incandescents.

Those inverters generally claim an efficiency of about 75-90%.  Check to see
if the inverter draws current when it's not under load. That should still
save you a good deal of power in the long-run over an 1156 bulb.

I have installed some 15W 110V fluorescent strip lights on the ceiling and
walls of my RV, plugging them into small 75W inverters, and they seem to
work quite well, but they don't start as easily, and buzz more loudly than
when running on regular AC.

I'm still waiting for good and affordable white LEDs.  At present, they are
very expensive, not much more efficient than incandescents, and the harsh
violet-white light isn't particularly easy on the eyes.






Posted by Ulysses on January 15, 2006, 10:24 pm
 



I measured about 2.4 amps at that voltage on one particular bulb but my
meter may have been reading a bit high (cheapo Harbor Fright digital
multimeter).


I measured .46 amps with one 12" CCFL tube.  I don't know how many lumens
but the amount of light seems to me to be more than what you get with one
1156 bulb.  The only problem I've had with the CCFL is an inverter failing
due to overvoltage while running it from an RV DC converter.  Also, the
light color on the white CCFL tubes is towards the blue spectrum but if you
just think of it as moonlight it's fine ;-).

I have been using one 12" CCFL light daily (well, nightly) for a few years
now and have not noticed any loss of brightness and the tubes do not get
dark at the ends.



Posted by Tim Thomson on January 15, 2006, 11:00 pm
 

Ulysses wrote:


What is a "ccfl" ?



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