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... yes we are a light manufacturer, but we have a comparison of common primary lights over a fairly broad range that might be helpful.
Cost Comparison | ||||||
---|---|---|---|---|---|---|
Incandescent | Halogen | CFL | LED (Generic) | LED (Philips) | LED (Philips L-Prize) | |
Purchase price | $0.41[23] | $4[24] | $4[25] | $10[26] | $16[27] | $30[28] |
Electricity usage | 60 W | 42 W | 13 W | 13.5 W | 12.5 W | 10 W |
Lumens | 860 | 570 | 825 | 850 | 805 | 940 |
Lumens/Watt | 14.3 | 13.6 | 63.5 | 63 | 64.4 | 94 |
Color Temperature Kelvin | 2700 | 3000 | 2700 | 3000 | 2700 | 2700 |
CRI | 100 | 100 | 82 | >75[29] | 85 | 92 |
Lifespan (hours) | 2,000 | 3,500 | 8,000 | 25,000 | 25,000 | 30,000 |
Bulb lifetime in years @ 6 hours/day | 1 | 1.6 | 3.7 | >11.4 | >11.4 | >13.7 |
Energy cost over 10 years @ 15 cents/kWh | $197 | $138 | $43 | $44 | $41 | $33 |
Total | $201 | $166 | $55 | $54 | $57 | $63 |
Comparison based on 6 hours use per day (21,900 hours over 10 yrs) |
Category | Design Parameter | Unit | Explanation (all parameters vary by current) |
LED Parameters | LED VF | V | Forward voltage of LED |
LED W | W | Power consumption of LED | |
LED LM | lm | Luminous flux of LED | |
LED LM/W | lm/W | Efficacy (lumens per Watt) of LED | |
Price Parameters (values will be blank if Price = $0) | LM/$ | lm/$ | Lumens per dollar of LED |
$/LM | $/lm | Dollars per lumen of LED | |
c/LM | ¢/lm | Cents per lumen of LED | |
System Design Parameters | SYS LM PER | lm | Luminous flux of each LED in system design. Note: SYS LM PER is affected by System Optical Efficiency while LED LM is not. |
SYS # LED | | Number of LEDs needed to achieve the specified System Target Lumens. | |
SYS W | W | Power consumption of entire LED system. Note: SYS W is affected by System Electrical Efficiency | |
SYS LM TOT | lm | Luminous flux of LED system | |
SYS LM/W | lm/W | Efficacy (lumens per Watt) of LED system. | |
SYS $ | $ | Total price of LEDs in the target LED system. |