Datenblatt-Suchmaschine für elektronische Bauteile |
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AB171 Datenblatt(PDF) 4 Page - Lumileds Lighting Company |
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AB171 Datenblatt(HTML) 4 Page - Lumileds Lighting Company |
4 / 13 page AB171 LUXEON SunPlus 35 Line for Horticulture Application Brief 20161110 ©2016 Lumileds Holding B.V. All rights reserved. 4 0.82 1.02 1.93 2.13 0.65 0.25 0.30 0.50 0.50 2.40 2.60 1.80 Solder mask Stencil Top copper Package geometric center Package and pad outlines Figure 2. Recommended PCB footprint design for the LUXEON emitter. In order to ensure proper heat dissipation from the package electrodes to the PCB, it is best to extend the top copper layer at least 3 mm beyond the package of the LUXEON emitter. All dimensions are in mm. 1.6 Mechanical Files Mechanical drawings for the LUXEON emitter are available on the Lumileds website at lumileds.com. 2. Optical Design Consideration To ensure optimum plant growth and power efficiency with artificial lights, there are two important optical design considerations: a. Uniform light and color (spectral) distribution. To avoid negative effects from phototropism, a high level of light uniformity is required. The main plant stem will grow towards the light source (minimize “hot spots”). The lower section of the plant leaves may be shadowed by the upper section thus reducing photosynthesis. Choosing the right LEDs, light source placement and/or using secondary optics (e.g. reflectors or lenses) can help to achieve the desired objective. While not yet proven, some studies have shown that the blue light promotes vegetative growth while the red light aids in fruiting and flowering, so a good mixing of such colors is sometimes essential. b. Maintain optimum PPFD (photosynthetic photon flux density in µmol/s/m2) level. PPFD follows inverse square law, i.e. it will change to the square distance from the plant. For area being illuminated, it follows the square law. Note that beyond certain optimum PPFD level, the rate of photosynthesis tapers off with increasing PPFD, thus reducing the rate of return on power consumption versus plant growth rate. The optimum PPFD level varies with each plant type. Please visit the Lumileds website for downloading optical rayset files, IES file format (per LM-63-02) and using Lumileds Design Tools for optical design and simulations. |
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