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Transcript
Evaluation Objective: The objective of this report is to evaluate the D1 Solar Lamp Light and measure the light output in lumens. This evaluation report is an independent review of light output of Dlight solar lights. It is suggested to refer to the manufacturer’s product specification for specific product data. Author: Cheryl Champagne Date: 07/02/2012 Revised 10/03/2012 1. Scope: To measure the light output in lumens of two solar lamps, the D1 small and D1 tall. 2. Definition: Brightness is a description of light output, which is measured in lumens (not watts). Two important measurements of white light (sunlight) quality are correlated color temperature (CCT) and color rendering index (CRI). CCT describes whether white light appears warm (reddish), neutral, or cool (bluish). The standard definitions of CCT allow a range of variation in color that can be readily discerned by viewers even when the CCT value is the same. On a scale of 0 (worst) to 100 (best), CRI measures the ability of a light source to reproduce the colors of objects faithfully in reference to an ideal light source — the sun. Most office, retail, educational, medical, and residential spaces require a minimum CRI of 70 – 90. Many white-light LED lighting fixtures available today achieve CRIs of 80 or better. The color of light (hue) may also affect how bright a light appears, even if the lumens are the same. Light closer to the color of daylight ( the Sun,color temperatures above 3000K) may appear brighter because the color of the light is pure white. Where a light falls on the Chromacity chart will show how close to natural sun light the measured light is at. It is a subjective view, some folks prefer a more yellow light (incandecent) some more of a blue. The attempt here is to show how close to natural daylight the solar lamps are. Wave length of UV light falls under 360 nm as IR wavelengths are above 750 nm on the light spectrum. 3. Material/Equipment: 3.1 D Tall solar Lamp 3.2 DSmall solar lamp 3.4 GigahertzOptik Model BTS256-LED measuring instrument and software 3.5 Dell Laptop 4. Purpose 1.1 The purpose of this evaluation is to verify the Solar Lamp Light Output in lumens of two models of the D1 solar lamps. 5. Analysis Measure the Light Output via integrating sphere and record data in numeric and graphical form for evaluation report. Small: Ra is the average CRI = 87.3 Light Output = 36 Lumens wavelength of LED light Chromacity Large: Ra is the average CRI =86.5 Lumens = 36 wavelength of LED light Chromacity 5. Results: The light output of both lamps equal 36.9 Lumens which is equivalent to approximately a 3.9 watt incandescent bulb. INCANDESCENT BULBS (WATTS) 25 40 60 75 100 125 150 MINIMUM LIGHT OUTPUT (LUMENS) 250 450 800 1,110 1,600 2,000 2,600 The CRI level are within .5 at 86.5 and 87.2 between the two lamps. A CRI above 70 is considered acceptable white light. On the small lamp, the wavelengths did not drop off (below zero) at 720-750 nm range as they did on the larger lamp. It would not be recommended to look directly into the light of the small lamp. The wavelength for IR on the larger lamp drops off at 650 nm. The UV wavelength for both lamps is at or near zero. The Chromacity level of the small lamp is closer to natural white light (sunlight) than the larger one. The larger one has a bit of yellow hue. 6. Conclusion: Either lamp will light a small area such a an entry way or very small room for a few hours.