|Light Source||Lamp Type||Total light output (lumens)||Luminous Efficacy (lumens/Watt)||Price at Amazon ($)||Lifetime|
|Maximum limit for any white light||Ideal ||250 lm/W|
|Open flame||Candle ||0.3 lm/W|
|Incandescent||100W incandescent||1490-1750  (GE Reveal: 1260 lm)||(12.6 lm/W)||1.02 ea||750 hrs|
|60W||750-1049  (GE Reveal: 840 lm)||(14 lm/W)||1.02 ea||1000 hrs|
|40W||360 lm||9 lm/W||1.02 ea||1000 hrs|
|Theoretical Limit||300 lm/W |
|Bare LED component||Luxeon Rebel ES||70 lm/W||~$2.00 |
|100W replacement bulb||Not available yet |
|60W replacement bulb (10W)||940 lm||94 lm/W||34.99 ea||27.4 yrs|
|40w replacement bulb (8.5W)||420 lm ||49 lm/W||18.79 ea||25000 hrs|
|T8 tube replacement (CR24)||4400 lm||100 lm/W|||
|100W CFL (26W)||1750 lm||67 lm/W||2.66 ea||8000 hrs|
|60W CFL (13W)||825 lm||63 lm/W||1.06 ea||8000 hrs|
|40W CFL||520 lm||52 lm/W||4.04 ea||8000 hrs|
|T8 tube (69W after ballast loss)||4767 lm||69 lm/W||||20000 hrs |
”Maximum efficiency of white light,” Tom Murphy, UCSD, http://physics.ucsd.edu/~tmurphy/papers/lumens-per-watt.pdf
 A candle is by definition one candela. The conversion from candela to lumens is: 1 candela x 4pi steradians/40W
 For purposes of helping consumers compare old-style incandescent ratings in Watts, the EPA set the output of 100W and 60W incandescents to 1490-1750lm and 750-1049 lm, respectively. The numbers used in the table are for GE Reveal bulbs because of their availability at big-box stores.
 Not available yet: announced by Switch and GE Lighting
 A Cree CR24 (44W) in single quantities costs about $250. It has no replacement bulb or maintenance costs associated with it over its 50,000-hr life. CRI = 90, 3500K
 This is the number from the DOE 2009 Solid-State Lighting CALiPER Program http://apps1.eere.energy.gov/buildings/publications/pdfs/ssl/caliper_round-9_summary.pdf benchmark Table 1d for 2×4 fluorescent troffers. 3248K, CRI=83
 Average rated life = 20,000. For fluorescent life ratings, this means that after 20,000 hours, half of the bulbs will have failed, and half will not. A conservative maintenance schedule will call for replacing the bulb at 60% of its rated life, or after 12,000 hrs.
 A high-bay commercial fluorescent light fixture for T8 tubes will cost about $170. The Philips bulb quoted here costs about $6 ea in quantity. Labor to replace the bulb will cost almost as much as the tube itself.
 This is a common white LED LXML-PWC2; 4500K; pricing from Future Electronics
 Single quantities. Cool white light. This is a very popular LED for lighting applications. Yes, there are more powerful LEDs available now from Cree as well as Lumileds, but the Rebel ES is a good baseline high-power LED.