geoffrey iwata phy h190 2/22/2012 - the budker...
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geoffrey iwataphy h190phy h1902/22/2012
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What are the Light Bulb Wars
Artwork by bloggerknight2009
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What are the Light Bulb Wars Energy Independence And Security Act of 2007 Requires roughly 25 percent greater efficiency for light b lb h d i f h h bulbs, phased in from 2012 through 2014
Effectively bans the manufacturing and importing of most current incandescent light bulbsmost current incandescent light bulbs
Rationale: 22% of US electricity consumption due to lighting (2010) 22% of US electricity consumption due to lighting (2010) That’s 13% of our total energy
Wikipedia.org
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What are the Light Bulb Wars Should incandescent bulbs be banned from production?
?
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Why are they controversial? "We are taking away a choice that continues to let people waste their own money” p p y
–Secretary Chu
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How did this battle arise?
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Where does the energy go?
US Energy Report 2001
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How many lumens do we need?
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What’s the matter with incandescent?
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Why is incandescent under attack?
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What’s the matter with incandescent? Let’s look at how they work Low pressure inert gas (argon,
i k )nitrogen, krypton, xenon) Tungston Filament ~ 3000K
M tl i f d t Mostly infrared spectrum Get Hot!
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What’s the matter with incandescent? Let’s look at how they work Low pressure inert gas (argon,
i k )nitrogen, krypton, xenon) Tungston Filament ~ 3000K
M tl i f d t Mostly infrared spectrum Get Hot!
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What’s the matter with incandescent?
Associated Press
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What’s the matter with incandescent? How are they made:
Cheaply Recipe since 1879 – filament, gas, bulb, wires
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Why are CFLs smarter?
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Why are Compact Fluorescent Bulbs Better?
How do they work? Electric current through mercury vapor excites ionized H tHg atoms
Hg atoms emit UV light – 253.7 and 185 nm Phosphor coating on glass fluoresces in visible range Phosphor coating on glass fluoresces in visible range
Current regulated by “ballast”
Howstuffworks.com
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Why are Compact Fluorescent Bulbs Better?
Power converted to visible light: CFL: ~22% (50‐70 lumens/watt)(5 7 ) Incandescent ~2% (10‐17 lumens/watt)
Heat production: Hot bulbs increase building’s air d ( l )conditioning costs (in warm climates)
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Why are Compact Fluorescent Bulbs Better?
Power converted to visible light: CFL: ~22% (50‐70 lumens/watt)(5 7 ) Incandescent ~2% (10‐17 lumens/watt)
Heat production: Hot bulbs increase building’s air d ( l )conditioning costs (in warm climates)
Last Longer CFL: 6000 15000 hours CFL: 6000‐15000 hours Incandescent: 750‐1000 hours
Energystar CFL report 2007
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Why are Compact Fluorescent Bulbs Better?
CFL Incandescent
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Why are Compact Fluorescent Bulbs Better?
CFL Incandescent
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How can we compare CFLs to incandescent?
1991
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How can we compare CFLs to incandescent?
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Why are Compact Fluorescent Bulbs Better?
CFL Incandescent
Easy bake ovenLow production impact
No mercury in
Cheap
L l
Power‐>lightMore efficient
No mercury in the bulbLast longer
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How can we compare CFLs to incandescent?
Consider 8000 hours of use:
CFL 13Watt 104 kWh
Incandescent 60 Watt 480 kWhIncandescent 60 Watt 480 kWh
‐Maryland Energy Administration‐Energy Star.gov
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How can we compare CFLs to incandescent?
But how about the mercury used? National Average Mercury emissions
0.012 mg/kWh
1 2 mg from 0 44 mg
1 6 mg
1.2 mg from electricity
use
0.44 mg from
landfilling
5 76 mg
5.76 mg from electricity use
0 mg from landfilling
1.6 mg 5.76 mg
CFL (uses 104 kWh) Incandescent (uses 480 kWh)
‐Maryland Energy Administration‐Energy Star.gov
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H CFL i d ?How can we compare CFLs to incandescent?
Energy Star.gov
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Why are Compact Fluorescent Bulbs Better?
CFL Incandescent
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How much money do we really save?
Incandescent: 32c / bulb CFL: $4.47 / bulb
The Home Depot
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How much money do we really save?
Incandescent: 32c / bulb CFL: $4.47 / bulb At best lifetime ratio: 15,000/750 = 20, saves $2/bulb~$2/bulb
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How much money do we really save?
Incandescent: 32c / bulb CFL: $4.47 / bulb At best lifetime ratio: 15,000/750 = 20, saves $2/bulb~$2/bulb
At worst lifetime ratio: 6000/1000 = 6, loses 6000/1000 6, loses ~$2.5/bulb
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But how about electricity costs?
Incandescent: 32c / bulb CFL: $4.47 / bulb Reasonable estimate of electricity cost – 20c /kWhF 8 h For 8000 hours: CFL: $20.80 Incandescent: $ 96 00 Incandescent: $ 96.00
!!!
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Why are Compact Fluorescent Bulbs Better?
CFL Incandescent
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Why all the fuss?
"It was never my goal for Washington to decide what type of light bulbs Americans should use“Americans should use‐Fred Upton (R., Mich.)
WSJ.com
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Why all the fuss?
"It was never my goal for Washington to decide what type of light bulbs Americans should use“Americans should use‐Fred Upton (R., Mich.)
In 2011, new bill introduced to disallow government spending to enforce new standards.
WSJ.com
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Why all the fuss?
"It was never my goal for Washington to decide what type of light bulbs Americans should use“Americans should use‐Fred Upton (R., Mich.)
In 2011, new bill introduced to disallow government spending to enforce new In 2011, new bill introduced to disallow government spending to enforce new standards.Light bulb manufacturers have already replaced fabrication lines:“A delay in enforcement undermines those investments and creates regulatory
t i t ” J h Hi b (N ti l El t i l M f t A i ti )
WSJ.com, poltico.com
uncertainty.” ‐ Joseph Higbee (National Electrical Manufacturers Association)
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Why all the fuss?
"The American people want less government intrusion into their lives, not more, and that includes staying out of their includes staying out of their personal light‐bulb choices."‐Michele Bachmann (R., Minn.)
(The bill) “was passed at the height of the global warming fad‐scare when all proper fad scare when all proper thinkers were supposed to sacrifice to the anticarbon gods.”‐WSJ editorial
WSJ.com, physicstoday.org
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Why all the fuss?
"I will concede over the life of the bulb...that you probably do save some money, but it takes a long time to save it ”long time to save it.‐Rep. Joe Barton (R., Texas)
WSJ.com
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Why all the fuss?
"I will concede over the life of the bulb...that you probably do save some money, but it takes a long time to save it ”long time to save it.‐Rep. Joe Barton (R., Texas)
Life of CFL bulb – 15000 hours at most – is about 2 years.Life of CFL bulb 15000 hours at most is about 2 years.
WSJ.com
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Conclusion
CFLs do make sense over incandescent bulbs.L f h h i b b Lots of the rhetoric seems to be about re‐election.
This remains a patch to a greater issue This remains a patch to a greater issue.