Fluorescent Bulbs

[_RaT_]

At first look CFL's seem to be a no brainer, but after further review I will have to put it into the same category as the Prius and ethanol. You buy them and they make you fell good, but they are not very echo friendly after all. CFL's do have alot of mercury in them. Proper disposal will be difficult to manage. I read on one web site that they actually recommend cutting up the piece of carpet that it broke on. The prius has too many byproducts from its battery production and disposal to really make it worth while buying and ethanol takes more energy to produce, than it actually produces. It also is driving up the cost of my cereal. Using food to make fuel, there is something just plain wrong with that.

So in short, use halogen lights, drive a Hummer, and drill in Anwar.

Actually they have very little mercury in them but then this has already been discussed.

 

[texasjohn]

What I want to see is somebody do a set of curves that relate initial bulb cost, operational cost and longevity... to a filament bulb initial cost and operational cost and longevity.... That is, how long does a bulb have to live before it pays for itself compared to a filament bulb. Let's not use the touted life of a CFL, but do a 1 week, 1 month, 6 month, etc life time for the CFL.

We have many testamonials to both short and long cfl ife...

my own experience tends toward the short life.... so the economic question is interesting.... assuming one ignores initial energy to manufacture both bulbs and disposal cost...

 

[_RaT_]

What I want to see is somebody do a set of curves that relate initial bulb cost, operational cost and longevity... to a filament bulb initial cost and operational cost and longevity.... That is, how long does a bulb have to live before it pays for itself compared to a filament bulb. Let's not use the touted life of a CFL, but do a 1 week, 1 month, 6 month, etc life time for the CFL.

We have many testamonials to both short and long cfl ife...

my own experience tends toward the short life.... so the economic question is interesting.... assuming one ignores initial energy to manufacture both bulbs and disposal cost...

I have had CFL's last for just a few months and I have some in my lamps that were given to me free by the utility company that are still going. That was back in 1991. Fluorescent bulbs can have life spans as high as 20,000 hours. There is a descrpancy in what is listed and sometimes what you get with a CFL in terms of life span. Maybe its quality control or perhaps a particular brand. The same is true of incandescent bulbs. I have had them last as short as 1/100th of a second from brand new as a result of not being sealed, I have seen some go for thousands of hours. The one thing without question is the lumens per watt advantage of fluorescent over incandescent. You simply cannot dispute that. On my outside lamp posts are cfl's. They are 15 watt cfl's, have been going for 3 years now every night automatically. The incandescents would last about 4-6 months and need replacing. They were 60 watt bulbs compared to the 15 watt cfl, they were indeed much dimmer. I also got these cfls for free from the hardware store. I can still easily choose to go incandescent but much prefer the greater light and lower power consumption of CFL. I do agree, I like having the choice.

 

[texasjohn]

I'll take all the free bulbs I can get... CFL or incandescent.... It's when a CFL costs $3.00 plus that their buy in cost begins to be noticeable. Wish ANY of the CFL's I have had would last even over a year.... none have so far... I've tried probably 25 or so so far.... most don't make it 6 months.

 

[RonMar]

I'll take all the free bulbs I can get... CFL or incandescent.... It's when a CFL costs $3.00 plus that their buy in cost begins to be noticeable. Wish ANY of the CFL's I have had would last even over a year.... none have so far... I've tried probably 25 or so so far.... most don't make it 6 months.

Wow, that sounds like a pretty dismal experience on your part. I have used various manufacture CFL's(free ones from the PUD and what's on sale at Cosco, wallmart ECT) and measure their longevity in years, not months.

I wonder what you electrical power looks like? How old is your home and wiring? Issues with power quality could be causing the shorter lifespan.

If my math is correct, a 15 watt CFL uses 1/4 the power of a 60W light bulb for about the same ammount of lighting. That is 45 Watt hours less per hour of use. 1KW divided by 45W = 22, so every 22 hours you are saving nearly 1KW of electricity over a 60W incandescent. At an average price per KW/HR of around .11(http://www.eia.doe.gov/cneaf/electricity/epm/table5_6_a.html), that bulb needs to run about 600 hours to recoup a $3 cost in saved electrical bills. At say 4 hours a day, 7 days a week, that is roughly 150 days to recover the cost.

This of course dosn't subtract the cost of an incandescent bulb that you didn't buy from the equation, which would make the payoff point less than $3.

Also if you pay more than 11 cents per KW/HR for electricity(linked website showed Texas at 12.2 cents per KW/HR for residential power in Nov 07) then the payback will be shorter(540 hours at 12.2C per KW/HR)...

 

[mjarrels]

I just bought a 4 pack a couple weeks ago and the package says 4 bulbs will equal 28 years worth of lighting... time will tell!

mark

 

[texasjohn]

being semi literate, I read the package re bulb life
Being naieve, I believed
I do not believe any of my bulbs... bought from HF and HD and Wally world lasted the 4 or so months to reach payback point.

There are two houses... one in the center of Georgetown
The other at the end of the Pedernales electric line in the country.

I noticed at the Mexican restaurant we frequent that they had put CFL's in their lights... the kind that have 4 or 5 bulbs in one fixture... about half of their CFL'S are burned out. I assume that they put them all in at once, but don't know... just observations....

I suggest you put your in-service date on your CFL's ... and hope your experience surpasses mine!

 

[txdon]

I took my Dad to a low vision specialist and learned that the fluorescents (bulb replacement type and long type) have different kinds of brightness that is measured in degrees Kelvin. The specialist said that Walmart/Homedepot do not have the brighter replacement bulb type for the brightness needed for my Dad. Special light places have the brighter bulbs. I brought one of the bulbs and the colors are closer to real than the yellowish lower kelvin temp ones.

Attached is a regular incandescent light bulb top, and a Walmart florescent bulb middle, and the special higher degree kelvin florescent bulb bottom.

The cedar is exactly the same color but at night with the lamps it looks like I have three different stains. The bottom is the color closest to the sunlight color and is the easiest light for my Dad to read by.

There is a brighter degrees Kelvin bulb but it is too harsh on the eyes like bright sunlight. I'm sorry I don't have the degrees numbers for you right now but I hope this helps with a goggle search.

 

[_RaT_]

I took my Dad to a low vision specialist and learned that the fluorescents (bulb replacement type and long type) have different kinds of brightness that is measured in degrees Kelvin. The specialist said that Walmart/Homedepot do not have the brighter replacement bulb type for the brightness needed for my Dad. Special light places have the brighter bulbs. I brought one of the bulbs and the colors are closer to real than the yellowish lower kelvin temp ones.

Attached is a regular incandescent light bulb top, and a Walmart florescent bulb middle, and the special higher degree kelvin florescent bulb bottom.

The cedar is exactly the same color but at night with the lamps it looks like I have three different stains. The bottom is the color closest to the sunlight color and is the easiest light for my Dad to read by.

There is a brighter degrees Kelvin bulb but it is too harsh on the eyes like bright sunlight. I'm sorry I don't have the degrees numbers for you right now but I hope this helps with a goggle search.

Don, what you are describing is the "color" of the light measured in a index called kelvin. The warm white or yellowish hue is 2700K. The cool white bulbs that were so common in 4' fluorescent were frequently 4000K also known as "cool white" I believe that 2700K is about as low a temp as they go but on the higher bluish end they go well above 4000K. There is a color rendering index that indicates how accurate the color is. Stores use different temps based on the product they sell. Myself, I prefer the more yellow light of 2700K. Sometimes the lumen (brightness) is slightly less per watt, but still quite efficient.

 

[txdon]

RaT, I just looked at the base of the floresent bulb (the bottom picture), it says 6400K. That is the K best for contrasting colors for reading for people with macular degeneration.