LED vs HPS? Dr. Youbin Zheng
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1 LED vs HPS? Dr. Youbin Zheng
2 Contents 1. Light 2. Light & Plants 3. LEDs and HPS 4. How to decide which lights are the right choice for you?
3
4 Light & Plants 1. Light & Assimilation 2. Light & Morphology 3. Light & Second metabolites 4.
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6 Light & Morphology
7
8 UV ( nm) UV-C ( nm): Can kill plants and other living organisms UV-B ( ): Can affect secondary metabolite accumulation (e.g. flavonoids), reduce cell and stem elongation, increasing branching, close stomates, cause stress, control powdery mildew UV-A ( ): Can affect secondary metabolites (e.g., increase phenolic compounds), leaf, flower and fruit colour, phototropism UV can also be used to prime plants to be more resistant to stresses (e.g., high light, drought and insects etc)
9 Blue ( nm) Reduce stem elongation Thicker and darker leaves Open stomates Promote rooting Flower initiation Increase anthocyanin
10 Lettuce grown under different LEDs
11 Green ( nm) Plants reflect more green in the visible light spectrum that s why most of the plants are green No that much research on green light so far Adding a small amount of green light to red and blue can result in a much whiter light
12 Red ( nm) Effective in preventing SD plants flowering Promoting flowering in LD plants Stimulate roots formation
13 Far red ( nm) Elongation Thinner and bigger leaves with thinner cuticles Reduce branching Leaf colour and anthocyanin? Promote rooting in cuttings Reduce morphological abnormalities under 100% artificial lighting environment
14 Different spectral combinations Red/Far red 1:1 outdoor lunch time in spring, Ontario (Llewellyn et al. 2013) High R/Fr: Reduce elongation Low R/Fr: Cause elongation
15 LED Fluorescent R:FR Mah, Llewellyn & Zheng (unpublished)
16 LED Fluorescent Mah, Llewellyn & Zheng (unpublished)
17 Different species may response to light differently!
18 Mah, Llewellyn & Zheng (unpublished)
19 Effects of EOD-FR light & high blue PF ratio 10B 10B+FR 50B 50B+FR EOD-FR light (6 µmol m- 2 s -1 for 3 minutes) Kubota et al, 2016
20 Taken outdoors at noon on a sunny day, PAR is 1850 µmol m -2 s -1 Taken under a singlelayer polyethylene greenhouse at noon on a sunny day, PAR is 1655 µmol m -2 s -1 (an 11% reduction vs. outdoors) Llewellyn & Zheng, unpublished
21 Zheng & Llewellyn, 2014
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23 Different manufacturers may use different technologies and the LEDs can be very different!!
24 Highest measured efficacies (so far) Lamp type Power consumption (W) Efficacy (μmol/j) INC CFL LED (INC replacement) HPS (mogul) HPS (double ended) 1,077/ LED (Horticulture) From: Wallace, C. and A.J. Both Evaluating operating characteristics of light sources for horticultural applications. Acta Horticulturae 1134:
25 Proposed horticultural lighting label Manuscript in preparation: Both, A.J., B. Bugbee, C. Kubota, R. Lopez, C. Mitchell, E. Runkle, C. Wallace. 20xx. Proposed product label for electric lights used in horticulture and plant biology.
26 Why LED & Considerations? Some advantages over the conventional lighting technologies: 1.Increasingly better energy efficiency
27 Why LED? Some advantages over the conventional lighting technologies: 2. Can provide specific wave lengths for Photosynthesis, Morphology (R/FR, B, G, R, FR, UV), Leaf and flower colours, Photoperiod, Second metabolites
28 Why LED? 3. Dimmable and can be rapidly cycled
29 Why LED? 4.Focused light (good or bad?) Nelson and Bugbee, 2014
30 5. Closer to plants Why LED?
31 Why LED? 6. Much longer lifespans?
32 Disadvantages Expensive Large footprints Some people do not feel comfortable working under certain light colors Not enough research conducted for most of the plant species
33 Are LEDs right for you? Indoor crop production with artificial light as sole lighting source
34 Are LEDs right for you? Greenhouse production with artificial light as a supplement to natural lighting
35 THANKS International Cut Flower Growers Association Joseph H. Hill Memorial Foundation, Inc David Llewellyn Jasmine Mah Katherine Vinson Yun Kong
36 ? CONTACT INFORMATION YOUBIN ZHENG Tel: Ext THANKS
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