xiv. modifying light intensity. a. supplementary artificial light 1. light intensity and quality...
TRANSCRIPT
![Page 1: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/1.jpg)
XIV. MODIFYING LIGHT INTENSITY
![Page 2: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/2.jpg)
A. Supplementary Artificial Light1. Light Intensity and Quality
•Quality–400-800 nanometers
• Intensity–100-300 mmols/sec/m2
–500-2000 ft. cds.•Distance vs. Intensity–decrease the greater the
distance
![Page 3: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/3.jpg)
2. Types of Lampsa. Incandescent• primarily red
light• point source• short life
b. Fluorescent• deficient in red?• 2', 4', 8' lengths• greater
uniformity• shadows
![Page 4: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/4.jpg)
c. Combination:
-fluorescent lamps
-incandescent lamps• complete spectrum
• shadows
• suitable for growth room
![Page 5: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/5.jpg)
d. High intensity discharge (HID)• Mercury vapor–not used today
• Metal halide–good spectrum– lower eff. than
HPS & LPS
![Page 6: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/6.jpg)
• High Pressure Sodium–high light
intensity
–400-1000 watt–eff. conversion
of energy
• Low Pressure Sodium–narrow band of
light–efficient
conversion
![Page 7: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/7.jpg)
New Lights for Greenhouses
Sulfur and microwave Diode
![Page 8: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/8.jpg)
![Page 9: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/9.jpg)
3. Commercial Applicationa. Crops
• Roses, chrysanthemums, seedlings, lettuce, tomatoes
b. Benefits• timing• quality• less prod. time; lower
cost• less fuel costs• increasing branching• increased keeping
quality
• roses; fewer blind shoots
![Page 10: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/10.jpg)
3. Commercial Application (contu.)c. Where used• northern latitudes• growth rooms
d. Installation/operating costs• fixture + ballast $150+• fixture + installation
$2.25/sq. ft.• operation:
$1.50/sq.ft./yr• depreciation• interest on money
borrowed
![Page 11: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/11.jpg)
3.Commercial Application (contu.)
e. Management
•Greenhouse
–HPS
• 400watt; spaced 10’ x 10’: 10 ft above plant
• 30-60 umols/sec/m2; 280-460 ft.cd.
•Oct to Apr
• night & cloudy days
![Page 12: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/12.jpg)
High pressure sodium light arrangement
![Page 13: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/13.jpg)
![Page 14: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/14.jpg)
![Page 15: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/15.jpg)
• Growth room
![Page 16: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/16.jpg)
Growth room• 20 sq. ft.• 2 ft. above plants
– 106 umols/sec/m2: 750 ft.cd.• 7 tubes: @ 40
watts
– 200 umols/sec/m2: 1400 ft.cd.• 13 tubes: @ 40
watts
![Page 17: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/17.jpg)
3. Commercial Application (contu.)f. Accumulated light• 200 umol/sec/m2
for 18 hrs.–equals 23
mol/day/m2
• Summer - natural light–48 mol/day/m2
• Winter - natural light–19 mol/day/m2
![Page 18: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/18.jpg)
![Page 19: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/19.jpg)
A. Reducing light intensity- Why- External• shading compounds–Latex paint: 1 part to 8-10
parts H2O–Saran cloth
– Internal permanent• Saran cloth•Aluminum strips
– Internal movable
![Page 20: XIV. MODIFYING LIGHT INTENSITY. A. Supplementary Artificial Light 1. Light Intensity and Quality Quality –400-800 nanometers Intensity –100-300 mmols/sec/m](https://reader035.vdocument.in/reader035/viewer/2022062320/56649c4e5503460f948f4e05/html5/thumbnails/20.jpg)
B. Increasing light intensity
–Clean covering
–White or reflective surface
–Reduce shade producing items