logo
Home Products Applications FAQ News Contact  
   

Products

LED Solar Street LightsLED Solar Street Lights
LED Street LightsLED Street Lights
LED Garden LightsLED Garden Lights
LED Projector LightsLED Projector Lights
LED Flood LightsLED Flood Lights
LED Tunnel LightsLED Tunnel Lights
LED Wall WashersLED Wall Washers
LED Underground LightsLED Underground Lights
LED Underwater LightsLED Underwater Lights
LED Bollard LightsLED Bollard Lights
LED Industrial LightsLED Industrial Lights
LED Light BulbsLED Light Bulbs
LED Panel LightsLED Panel Lights
LED SpotlightsLED Spotlights
LED DownlightsLED Downlights
LED Light TubesLED Light Tubes
LED Gas Station LightsLED Gas Station Lights
 
   

Applications

Home LightingHome Lighting
Hotel LightingHotel Lighting
Office/SchoolOffice/School
Retail/SupermarketRetail/Supermarket
Industrial LightingIndustrial Lighting
Roadway LightingRoadway Lighting
Tunnel LightingTunnel Lighting
Landscape LightingLandscape Lighting
Solar LightingSolar Lighting
Courtyard LightingCourtyard Lighting
Parking Lot LightingParking Lot Lighting
Filling Station LightingFilling Station Lighting
 
   

News

 
   Links
Wiki LightWiki Light
return the homepage Home  >Spectral Power Distribution
Share |

SPD Curves–Precise Lamp Profiles
A spectral power distribution (SPD) curve shows the precise color output of a given light source by charting the level of energy present at each wavelength across the visible spectrum. An SPD diagram of sunlight at midday, for example, clearly shows it to be an exceptionally balanced light source—all wavelengths of visible light are present in nearly equal quantities. Logically, an even curve like this indicates outstanding color rendering abilities. When compared to artificial light sources, sunlight exhibits large amounts of energy in the blue and green portions of the spectrum, making it a cool light source with a high color temperature (5500K). SPD diagrams can also be very useful in understanding how various lamps differ in the color composition of their light output.

Incandescent Technology
All incandescent light is produced by heating a solid object—the filament—until it radiates light. In a sense, this is the way light is produced by the sun. It follows, therefore, that both standard incandescent and halogen lamps exhibit smooth, even SPD curves, not unlike sunlight. Because the blackbody radiator used to measure color rendering also generates light in this fashion, incandescent lamps score very high in CRI ratings. This does not mean, however, that they render all colors in an identical manner. Standard incandescent lamps produce very little radiant energy in the short wavelength end of the spectrum and therefore do not render blues very well. Halogen lamps have a flatter curve with more energy at lower wavelengths, so they brighten blue and violet colors.

HID Technology
The electric arc that powers any gaseous discharge light source tends to produce narrow bands of energy at specific wavelengths. The SPD curves for HID lamps therefore feature spectral energy spikes related to these “resonance lines.” The addition of halides to the arc stream of a METALARC® 150W lamp allows it to achieve a fairly balanced curve. However, note that it is still somewhat uneven. The SPD diagram explains why standard metal halide lamps achieve good, but not exceptional, CRI ratings. In actual use, metal halide lamps often provide better color response than their CRI measurements indicate. The SPD curve for a LUMALUX® lamp shows virtually all of the spectral energy in the yellow/orange range. Clearly, this lamp cannot render a broad range
of colors, which is why high pressure sodium lamps are not recommended unless color rendition is not critical.

RSS
About Us         Learn Lighting         Documentation     Distributor         Warranty         Blog         Careers         Links         Sitemap         Index         
 
logo│© 2017, CommSun Lighting Co.,Ltd. All RIGHTS RESERVED

LED Light Bulbs   LED Panel Lights   LED Downlights  LED Spotlights  LED Tubes   LED Street Lights   LED Flood Lights    LED Industrial Lights    Solar Street Lights