Matthew_B
The boonies near Dallas, Oregon
Senior Member
Joined: 08/18/2005
View Profile
 Offline
|
If you want efficient light, you can't beat 12V CFL:
LINK
They are a bit big, and may not fit in smaller 12V fixtures. Supposedly bayonet base 12V CFL are available, but I've never seen anywhere that you can buy them.
They are available at lower power ratings than the straight tube fluorescent lamps. For when you need bright light, you can't be the thin lights. But when you only need a bit of light, the 5W or 7W CFL will give you a fair amount of light without much power.
|
smkettner
Southern California
Senior Member
Joined: 03/21/2005
View Profile
Good Sam RV Club
|
Salvo wrote:Those leds still output about 3.7 times less light than the pair of 1141 incandescent bulbs.
Not sure, but the 1141 output about 10 lumens/watt.
Two bulbs consume 34W, or output 340 lumens.
The WHP9 outputs 92 lumens at 2.28W (40 lumens/watt).
You would need 3 of those WHP9 led packages to get equivalent light. LED light efficiency is 40/10 = 4 times greater. At $22/package, the cost is still too high.
Sal
smkettner wrote:T10-PCB-WHP9 in cool white
Not cheep but they work great. For areas that are OK with less light like the bunks I have the warm white, a little softer too.
You are technically correct. (although it does say 120 lumens not 92) However consider the incandescent starts to really get dim as you approach 12.0 volts, probably less lumens also. LED seems to be constant output as the battery voltage dips. And I can have pretty much all lights on instead of all of us huddled around one fixture. So if more light is needed another fixture or two goes on. Everyone seems happier when more lights can be on without regard to power consumption. As you know when the girls are happy everyone is happy 
As far as cost I figure it has saved me from 2-300 watts of solar and an MPPT controller. What's that worth? Besides it is an RV, cost is not always the prime consideration.
2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
|
Jaybirdsdu
Pottstown, Pa
Full Member
Joined: 07/28/2009
View Profile
Offline
|
Can we please get back to my original question about determining amp hours?
|
pianotuna
Regina, SK, Canada
Senior Member
Joined: 12/18/2004
View Profile
Good Sam RV Club
Offline
|
Hi Salvo,
There is a "new kid on the block" that is doing much better in the lumens department at 3.6 watts and 252 lumens (70 lumens per watt) in a "warm white" color spectrum. Have a look here.
Warm White LED
I will be ordering these for my storage compartment lights, the bathroom and wardrobe lights.
Salvo wrote:Those leds still output about 3.7 times less light than the pair of 1141 incandescent bulbs.
Not sure, but the 1141 output about 10 lumens/watt.
Two bulbs consume 34W, or output 340 lumens.
The WHP9 outputs 92 lumens at 2.28W (40 lumens/watt).
You would need 3 of those WHP9 led packages to get equivalent light. LED light efficiency is 40/10 = 4 times greater. At $22/package, the cost is still too high.
Sal
smkettner wrote:T10-PCB-WHP9 in cool white
Not cheep but they work great. For areas that are OK with less light like the bunks I have the warm white, a little softer too.
Regards, Don
Kustom Koach Class C 28'5" 256 watts solar, 875 amp hours in two battery banks 12 volt batteries 2500 watt inverter.
|
Salvo
California
Senior Member
Joined: 06/01/2008
View Profile
Offline
|
Jaybirdsdu wrote:Can we please get back to my original question about determining amp hours?
Jbird- you had more than 3 excellent answers for your request. Have you done your homework and studied those links? What don't you still understand?
smkettner- yes, the 12V bulbs probably output less lumens. I did a search but didn't get any results. It would be great if someone can find the answer. And I did error in choosing the soft white leds @ 92 lumens rather than the hard white (which you chose) @ 120 lumens.
Another thing about the bulb is perhaps 25% of the brightness is lost because it is shining back against the fixture. The led fixture Don mentioned has the same problem.
If Mama is happy with the lights (leds), we're happy. ;-)
Don- Those lights look interesting. We'll be waiting for a report on them.
Sal
|
|
|
smkettner
Southern California
Senior Member
Joined: 03/21/2005
View Profile
Good Sam RV Club
|
Jaybirdsdu wrote:Can we please get back to my original question about determining amp hours?
I have 464 and can go about a week with very little conservation.
|
pnichols
Santa Cruz Mountains
Senior Member
Joined: 04/26/2005
View Profile
|
"Another thing about the bulb is perhaps 25% of the brightness is lost because it is shining back against the fixture."
That is not the case with these warm white SMT LED fixtures I'm using. Each of the 48 LEDs fire out with their 120 degree spread from the flat PCB surface with of course no light lost out the backside. The five socket adapter types that they come with make them usable in at least a couple of common stock RV fixtures:
http://www.v-leds.com/SMT-LED/Warm-White........c152366-2-3//page/1/checkForLanding/true
That 252 lumen spec of the socketed LED cluster in Don's link above does appear to be plenty high enough - they definitely must be the high power type SMT's.
We're finding that use of the proper LEDs in selected high use areas does indeed increase the "virtual amp hours" of our RV's battery bank by reducing our usage of real amp hours. As someone mentioned above, we can turn on several of our PCB mounted LED lights to give about the same overall interior light as a lesser quantity of incandescent lamps would provide, but still with a total amperage draw way less than what those incandescents would draw.
Phil, 2005 E450 Itasca 324V Spirit
|
smkettner
Southern California
Senior Member
Joined: 03/21/2005
View Profile
Good Sam RV Club
|
I looked at those with ~252 lumens and after trying the 120 lumen LEDs I decided it was enough light and I can save that much more power by getting on fine with less light. Some of the power savings is from less light.
I have read more than one post looking for incandescent with lower wattage to save power so getting by with less light to save power does not seem unreasonable.
|
Brent and Gina
Arkansas
Senior Member
Joined: 12/28/2008
View Profile
Offline
|
I had to get a replacement recessed light for my Cameo and found exactly what I needed at LEDTrailerLights.com. While there in "RV Lights and Accessories" section at bottom of that page, I found the 10 LED 98 lumen plug in replacement. It appears to be just as bright as the 12V halogen that comes stock. I can imagine the 18 LED 252 lumen is extremely bright. At 205ma, isn't that worth adding to this convo? I mean, no need to worry about finger oil, 205ma, 100,000 burn hours, and only $14.50 each, I'm convinced.
|
pianotuna
Regina, SK, Canada
Senior Member
Joined: 12/18/2004
View Profile
Good Sam RV Club
Offline
|
Hi all,
I've found another led that I'd consider:
270 lumens
It is a bit more money--but the format should provide more light than the "mast light" configuration. They do ship to Canada as well.
|
|
|
