UP BLDR, I don't want to hijack the thread, but I am VERY interested in putting in a furnace that has no blower, if it is safe to do so. Have you posted anything about that project?
Also, to get back to the thread, bcrewcaptain said that his LEDs draw .02 amps, while the incandescents drew 1.5 amps. I am terrible at decimals -- does that mean that the LEDs are 75 times more efficient? Please forgive me if I am missing something. I had thought that LEDs used about a tenth of the power, but that is way better than a tenth. Wow!
2012 Fun Finder X-139 "Boondock Style" (axle-flipped and extra insulation)
2013 Toyota Tacoma Off-Road (semi-beefy tires and components) Our trips -- pix and text About our trailer
profdant139 wrote: UP BLDR, I don't want to hijack the thread, but I am VERY interested in putting in a furnace that has no blower, if it is safe to do so. Have you posted anything about that project?
Also, to get back to the thread, bcrewcaptain said that his LEDs draw .02 amps, while the incandescents drew 1.5 amps. I am terrible at decimals -- does that mean that the LEDs are 75 times more efficient? Please forgive me if I am missing something. I had thought that LEDs used about a tenth of the power, but that is way better than a tenth. Wow!
I have a thread about my Sunline rebuild in the vintage TT section - UP BLDR's Sunline rebuild thread. There's some pics on the last page of the furnace install. Was pretty easy, but did need to do some modding to make it work. Worth the effort, and heats the camper easily, all without power. I put an add on Craigslist looking for one, and found 3. And your math is correct.
For most applications, replacing incandesent lamps with LED is a significant power savings. The same cannot be said for flouresent. The latest LED technology is a BIT better than flouresent but not by much so mostly don't bother with the LED conversion for flouresent fixtures.
In fact, we changed all our lamps to LED except the over counter fixture in the kitchen where we installed a dual tube 18" flouresent warm white. Lots of light in the food prep and dishwashing area when needed.
The newer warm white LEDs really are a great replacement option and save a great deal of power.
2008 Damon 3575 (38ft, forward kitchen)on Ford 22k chassis
It depends on how much you boondock. We just completed a 79 day trip. We had power only 21 days- the rest was boondocking. A solar panel and led lights made all the difference. We can read an hour or two, watch an hour or two of TV and run the heater if needed and never draw the 2 12volts below 12.2 amps. The LEDs are definetly worth it and if you do your homework and watch your lumens and color intensity you will be more than satisfied. No question in my mind!
The current I see for my 6x6 panel, 36 LEDs, is .25 amps. Do those 12 LED ones really only take .02 amps?
Thanks,
Tom
By the way anyone interested in 27 incandescent 1141 base bulbs
well,I'm seeing .025 each, but that is at about 15 volts too, but yeah, time to trash the old ones, well worth it, I can't wait for a good boondocking trip in 2 weeks to try them all out
*Current draw-The main reason these were purchased , was to increase my dry camping time. The old bulbs had a draw of roughly 1.3-1.5 amps each when lit. The LEDs are .02amps each. Not counting the 2 florescent fixtures and the stove lights(which will be done as well) I have knocked back the power amazingly.
Nice work bcrewcaptain -- very sanitary looking install!!!
There is an error in the amperage rating of the LED panels you used.... those LED disks use roughly 0.2 amps each instead of 0.02 amps. You used two to replace one incandescent bulb, for a total of about 0.4 amps per side. The original incandescent bulb used about 1.5 amp, so you are using about one forth the power, but you have a lot more light with those two disks.
For anyone that is interested, here is a little technical information. The disk LED panels bcrewcaptain used have twelve 5050 smd leds each. Each 5050 SMD LED actually contains 3 individual LEDs inside their package (if you look closely, you can see 6 leads soldered to the circuit board -- 2 for each of the 3 LEDs), while the 1210 SMDs used on the most common 36 or 48 LED rectangular panels have only a single LED inside their package. So the panels bcrewcaptain used put out about the same amount of light as a comon 36 LED rectangular panel. Since bcrewcaptain used 4 disks in each of his double sided fixtures, that is equivalent to 4 of the 36 LED rectangular panels. That is putting out nice light for sure!
I recently converted a florescent twin tube fixture to LED, as reported in this thread.
I used 6 each 36 LED rectangular panels, and have the switches set up so either 3 or 6 panels light up. This is my main ceiling light, and it is plenty bright for everyday use with just 3 panels lit (3 panels are actually brighter than the original double tube florescent). But when I need a really bright light for some reason, I kick on the 2nd three panels.
The florescent fixture was rated at 16 watts, and had a current draw of about 1.5 amps. Now, when I run the converted fixture with 3 panels lit, I am using only about 0.6 amps and have more light.
jcthorne wrote: For most applications, replacing incandesent lamps with LED is a significant power savings. The same cannot be said for flouresent. The latest LED technology is a BIT better than flouresent but not by much so mostly don't bother with the LED conversion for flouresent fixtures.
In fact, we changed all our lamps to LED except the over counter fixture in the kitchen where we installed a dual tube 18" flouresent warm white. Lots of light in the food prep and dishwashing area when needed.
The newer warm white LEDs really are a great replacement option and save a great deal of power.
Interesting, I have all LED except two 18 inch floro. fixtures and have been thinking about converting them. Anyone have numbers on floro vs Led. Just as soon avoid the expense if I can.
profdant139 wrote: LEDs draw .02 amps, while the incandescents drew 1.5 amps. I am terrible at decimals -- does that mean that the LEDs are 75 times more efficient?
Your math is fine. If they have the same lumen output, yes. I cannot verify any of that.
I posted a chart recently. The efficiency is almost identical between led and T8 florescent. Wait for led's to get a little better--or until a ballast goes bad.
Raften wrote:
Interesting, I have all LED except two 18 inch floro. fixtures and have been thinking about converting them. Anyone have numbers on floro vs Led. Just as soon avoid the expense if I can.
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