CFL vs LED Light Bulb Thread

[easysurfer]

Evolution from the Chevy Volt thread...

Should I upgrade my light bulbs to LED

Let the debate on CFL vs LEDs begin

I did go ahead and test out that $20 LED bulb I bought from Home Depot. As a 1 bulb task light, I'm quite pleased. $20 is still pretty much for one bulb -- I consider in an investment, not a general purchase

 

[ls99]

I have 8 CFLs in the garage. Put them in there 4 years ago. Except for one that was impacted by a ladder an broke they all are working.

Not using them in the garage door opener.

DW hates the color.

Also have six in the kitchen recessed light fixtures. DW hates the color, the lack of spectrum. This was done 'cause the recessed light fixtures are not insulation contact rated, incandescents make too much heat. I did not and still will not go through the work of replacing the recessed fixtures. So this was an easy, quick and low effort and low cost solution. Added bathroom type sealed cover with a gasket to eliminate free air flow into the attic. When we moved in, insulated the attic and around the fixtures.

Also the outdoor lantern style lights, on the garage walls, 5 of them, plus 4 on the patio have CFLs. About three years now, but we don't turn them on all that often. Garden lighting is solar rechargeable LED 10ea.

So in a few application they are useful.

CFLs lack of color spectrum truly sucks big time.
Did I say the colors are truly ugly?

Edit add: We Will Not Upgrade the CFLs to LED. Just don' see it as cost effective.

 

[easysurfer]

I had one CFL that needed replacing in my kitchen light and the bulb fits there, but the one I got was is only 40 watt equivalent (though seems more like about 50 watts of bright white light to me) but I'll wait at least until 60 watt equivalents become more affordable.

My approach now is until they come down in price (to around $5 a bulb) I still have some extra CFLs around and will use these up first.

I do like the one $20 bulb that I got and use at my computer area task light.

 

[youbet]

I just ordered 4 LED replacements for the 12V incandescents currently in my camper. $21.95 ea plus shipping. Ouch!

This is strictly a power conservation measure as we do a lot of boon docking and the incandescents pull 8X more current than the LEDS.

 

[mf15]

Just about all my CFL's burned out in less than a year,two different manufactures.
Expensive experiment.
Old Mike

 

[M Paquette]

For what it's worth, I used to do electrical related engineering stuff, and fiddling around with these sorts of details appeals to my OCD.

I currently use compact fluorescent lamps with a high frequency ballast (pretty much all the newest ones come with this). These tend to be flicker free and have a power factor close to 1.0. I install these lights in locations that tend to be on for hours at a time, particularly where replacement is relatively difficult. They're currently installed in outdoor lighting fixtures, where I used a CFL designed for such use, and in indoor passage and nightlight applications (little 5 watters here). The outdoor lamps have been in service for about 10 years, and the interior ones from seven down to one year. They're holding up about as expected.

Elsewhere, in hard to reach locations, where I have dimmer circuits or where the lights are switched on for short periods, I am using quartz halogen lamps, mostly the MR16/GU10 base. These are almost twice as efficient as conventional incandescent bulbs, or half as efficient as fluorescent bulbs, but are better suited for the application. I use these in our master bath and walk-in closet and our entertainment room. (DW doesn't like me to call it a Man Cave or Home Theater. ) I've had one bulb out of the 14 installed fail in the past year. Four have been in service for three years, the rest less than one.

I may eventually swap out some of the GU10 halogen lamps for LED lamps, as the prices drop. I've noticed a few of these coming on the market with brightness comparable to a 20 watt halogen lamp, but still at a very high price. At least one is dimmer compatible, no doubt with some clever electronics in it's built in power converter.

 

[KB]

I think every bulb in my house is a CFL, I replaced them when I moved in 6.5 years ago. One is starting to flicker in my closet now, but the rest are the original bulbs. I buy my bulbs at either Costco or Sam's club in the multi bulb packs. I even use them in my garage opener and outdoor porch lights.

 

[ERD50]

So here's an article that actually seems to have some references for the 'embodied' energy of CFL versus ILB.

Compact Fluorescent Light Bulbs ? A Tale From Dust to Dust | the Watt

It takes roughly 50 hours ( I got 65?) of use for the CFL to break-even with an ICB. Not a problem for high usage places, but they could be burning out from on/off cycles if you use them in places that only get 10 minutes a day or something.

and in indoor passage and nightlight applications (little 5 watters here).

Would there be any savings here? That's a pretty small wattage.

-ERD50

 

[Midpack]

Surprising thread. We had an old style (circular flourescent tube) in our closet, it lasted about 12 years. And we've replaced almost every bulb in our house (about 15) over the past 2-4 years, and none have failed yet. Some are used sporadically, others daily. Some were the somewhat expensive GE CFL's but most have been the Home Depot 4 packs made offshore (?). We'll see...

 

[calmloki]

I try to use CFLs in high use areas where we are paying the electricity, especially if I can get them at little cost. Several of the rentals got upgraded insulation and windows and CFLs were a gimme under state partial funding of the upgrades. As tenants moved out I would swap the CFLs to higher use areas - like common area and walkway locations where we burn the lights 14-16 hours/day. I got grumpy at the speed with which they burned out, but note on packaging that the ten year touted life is based on a couple hours use per day; a year and 8 months is about to spec in our walkway application.

 

[Gotadimple]

CFLs lack of color spectrum truly sucks big time.
Did I say the colors are truly ugly?

+1 on the color factor. I use them in the stairwells, where bright white light is helpful. I tried one in my kitchen yesterday as one of the BR40's burned out -- no go, big time -- way too bright!

 

[calmloki]

+1 on the color factor. I use them in the stairwells, where bright white light is helpful. I tried one in my kitchen yesterday as one of the BR40's burned out -- no go, big time -- way too bright!

BTW - have found that putting a CFL and an incandescent in the same enclosed fixture results in really fast CFL burnout - they don't like the high heat.

 

[W2R]

I think most of you probably use a lot more artificial light than I do. It's not uncommon for me to have NO lights on other than the TV and/or laptop and/or an LED booklight operated with 3 AAA cell batteries that last forever. Other times I have one 60W incandescent light on, never more than one, and I am perfectly happy with no more lights than that. Different strokes for different folks, I guess.

 

[ERD50]

Other times I have one 60W incandescent light on, never more than one, and I am perfectly happy with no more lights than that. Different strokes for different folks, I guess.

Heh-heh - I'll be sure to tell DW and the two kids that are home and their friends hanging out that we all should huddle around a single bulb at night.

Also, being that you are further south, you won't have as much variation in sunset as we do up north. It gets dark around here at 5PM in winter. So not just different strokes for different folks, but different conditions as well.

-ERD50

 

[harley]

+1 on the complaints about the color.

Elsewhere, in hard to reach locations, where I have dimmer circuits or where the lights are switched on for short periods, I am using quartz halogen lamps, mostly the MR16/GU10 base. These are almost twice as efficient as conventional incandescent bulbs, or half as efficient as fluorescent bulbs, but are better suited for the application. I use these in our master bath and walk-in closet and our entertainment room. (DW doesn't like me to call it a Man Cave or Home Theater. ) I've had one bulb out of the 14 installed fail in the past year. Four have been in service for three years, the rest less than one.

I may eventually swap out some of the GU10 halogen lamps for LED lamps, as the prices drop. I've noticed a few of these coming on the market with brightness comparable to a 20 watt halogen lamp, but still at a very high price. At least one is dimmer compatible, no doubt with some clever electronics in it's built in power converter.

One of my biggest complaints with the CFLs is the lack of dimmability. They make them dimmable, but if you are foolish enough to pay the extremely high cost you'll find that they flicker and don't really dim, they sort of like chunk down in wattage.

I'm curious, do the halogens dim properly? And don't halogens usually run really hot? How do they compare color-wise? Aren't they sort of blue?

Personally, I'm stocking up big time on the incandescents. Can anybody say black market come 2012? I'll have to change my name to Harley Medellin.

 

[M Paquette]

Would there be any savings here? That's a pretty small wattage.

The little 5 watt fluorescents replace 25 watt incandescents, and have a much longer installed life in this application. They wind up being on about 8-10 hours a day. That adds up to about 200 watt-hours per fixture per day, or 12 kilowatt-hours per month for two fixtures, or rounded to $3.49 a month ($41.85/year) at the $0.29062/KWh marginal rate. The CFBs last several years in this application, whereas the conventional light bulbs lasted around 6 months to a year.

The house is already pretty energy efficient, so yes, this is a small savings, but that is pretty much what anything we do would be at this point. Out utility bills run around 50-60% of the average for this neighborhood. All the little things add up after a while.

 

[ERD50]

The little 5 watt fluorescents replace 25 watt incandescents, and have a much longer installed life in this application. They wind up being on about 8-10 hours a day. That adds up to about 200 watt-hours per fixture per day, or 12 kilowatt-hours per month for two fixtures, or rounded to $3.49 a month ($41.85/year) at the $0.29062/KWh marginal rate. The CFBs last several years in this application, whereas the conventional light bulbs lasted around 6 months to a year.

OK, thanks. Your electric rate is almost 3x mine, so everything makes three times more sense now!

Our night lights were just those little 7W bulbs, but maybe you have a bigger space to light up. Most we have now are LED or Electroluminescent (eerie green glow). They wouldn't even get above the threshold of my Kill-a-Watt meter, so very low power. I bought the ELs years ago, and I think DW just picked up the LED ones when the old plug-in style fixture broke when cleaning or something. Nice thing about these is that they are so low power, they don't bother with the ambient light sensor, which usually caused annoying flicker (and yes, the engineer in me wanted to tweak the thresholds and hysteresis in the circuit ; wait, that's not so funny, I actually did that in our solar lawn lights - they stay lit all night now). And the LED should last 10 years or so, so no nuisance replacement of bulbs.

And my wife bought them already, so I don't even have to do any cost justification! What's done is done (or is that 'Watts done is done'?).

-ERD50

 

[M Paquette]

One of my biggest complaints with the CFLs is the lack of dimmability. They make them dimmable, but if you are foolish enough to pay the extremely high cost you'll find that they flicker and don't really dim, they sort of like chunk down in wattage.

I'm curious, do the halogens dim properly? And don't halogens usually run really hot? How do they compare color-wise? Aren't they sort of blue?

The 'dimmable' fluorescents seem to use some sort of half-smart power supply, and 'dim' in a couple of steps. One I've tried just switches off one of two tubes as it is 'dimmed'. I guess it behaves about like an incandescent bulb on a high-low switch.

The halogen bulbs seem to dim just fine. The biggest gotcha when used on a dimming circuit is that the quartz envelope won't get hot enough when dimmed to drive the halogen cycle that keeps the bulb clean of deposited tungsten vapor. Running at full brightness for a little while clears this up, though.

The halogen bulbs are hotter than most incandescent bulbs, and produce a whiter light. It's still 'warmer' in color than daylight by quite a bit, though. I like them for reading and general task lighting, and have halogen or pressurized xenon lamps installed for undercounter and room lighting in much of the house.

 

[Walt34]

I use CFLs on all the outside lights, which I leave on all night. Some are a pita to replace since doing so requires an extension ladder and the lower power usage appeals too. Collectively they burn about 120 watts. Many of the inside lights have dimmer switches on them so CFL's are ruled out there.

When LED's come down in price I'll consider them as the CFL's burn out. If they can be dimmed then I'll probably use them inside.

 

[Zathras]

All our lights were originally CFL.
1-2 years ago I replaced about a dozen withe LEDs (mainly recessed fixtures).
I like the longer life of the LEDs and the fact that the one I dropped from 7 feet didn't break
I also didn't want any delay in illumination at our front step in the cold season, so the front step light is now LED as well.

 

[My Dream]

I also had a problem with the colour of the CFL's when I first started using them. I then found out about colour temperture and now use 6500k for outdoor lights as well as undercounter kitchen and a couple other rooms and I love it. I've had several neighbours as me how my outdoor lights look so bright and daylight and they're only 13 watts each.