PS LEDlamps
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Transcript of PS LEDlamps
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Using the Spectroradiometerto Evaluate LED Lamps
A.J. Both1,
Mark Blonquist2, Ray Johnson2,
Alec Hay3
, Bruce Bugbee3
1 Rutgers University2 Apogee Instruments, Inc.
3 Utah State University
NCERA-101, April 14-17, 2007
Tuskegee University
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LED Lamps
Super Blue
Super Red
InfraredCool White
Warm White
LEDTRONICS, INC. 38 LEDs
Plant Bar
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Unit Price of LED Lamps
$160LED-PLANTBAR-001Plant Bar
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Single Wavelength LED Lamps
RQE: Relative Quantum Efficiency (McCree, 1972; Sager et al., 1988)
0.0
0.2
0.4
0.6
0.8
1.0
350 400 450 500 550 600 650 700 750 800 850
Wavelength (nm)
Normalized
PhotonFlux
Sunlight
Blue LED
Red LED
Infrared LED
Plant Bar LED
RQE
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Comparing Cool White Lamps
RQE: Relative Quantum Efficiency (McCree, 1972; Sager et al., 1988)
0.0
0.2
0.4
0.6
0.8
1.0
350 400 450 500 550 600 650 700 750 800 850
Wavelength (nm)
Normalized
PhotonFlux
Sunlight
FCW
CW LED
RQE
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Comparing Warm White Lamps
RQE: Relative Quantum Efficiency (McCree, 1972; Sager et al., 1988)
0.0
0.2
0.4
0.6
0.8
1.0
350 400 450 500 550 600 650 700 750 800 850
Wavelength (nm)
Normalized
PhotonFlux
Sunlight
FWW
WW LED
RQE
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Other Commonly Used Lamps
RQE: Relative Quantum Efficiency (McCree, 1972; Sager et al., 1988)
0.0
0.2
0.4
0.6
0.8
1.0
350 400 450 500 550 600 650 700 750 800 850
Wavelength (nm)
Normalized
PhotonFlux
Sunlight
HPS
MH
INC
RQE
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Spectral EfficiencySpectral Efficiency = [(PF)i * (RQE)i]343-800/ (PF)343-800
0.92Plant Bar0.64SUN
0.82Warm White0.86/0.87FCW/
0.80Cool White0.49INC
0.98Super Red0.78MH
0.72Super Blue0.89HPS
Spectral
Efficiency
LED
Lamps
Spectral
Efficiency*
Common
Lamps
* Bugbee, 1994: PPF Correction Factor = [(PF)i * (RQE)i]360-760/ (PAR)400-700
FWWCFL(SW)
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LED Lamp Observations
Build your own spectrum
Low power consumption (10 Watt/Lamp)
Long lamp life (50,000-100,000 hrs) High shock/vibration resistance
Cool bulb surfaces
Replacement for INC?- Possibly, but may need a source of far-red
Replacement for FL?
- Possibly, but light distribution may be an issue
Plant Bar: similar applications as light engine(lightcicle) used by colleagues at Purdue?