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Full-Text Articles in Life Sciences
Supplemental Greenhouse Lighting: Return On Investment For Led And Hps Fixtures, Jacob A. Nelson, Bruce Bugbee
Supplemental Greenhouse Lighting: Return On Investment For Led And Hps Fixtures, Jacob A. Nelson, Bruce Bugbee
Controlled Environments
LED fixtures are being marketed as a replacement for high pressure sodium fixtures in greenhouse lighting. Here we compare the cost per photon for LED and HPS fixtures based on their ability to convert electrical energy into photons delivered to a horizontal surface below the fixture. Some LED fixtures now exceed the efficiency of the best HPS fixtures by 23%, but the initial capital cost per photon delivered is 5 to 10 times greater. HPS fixtures with electronic ballasts and optimized luminaires (reflectors) are 27% more efficient than widely-used HPS fixtures with magnetic ballasts. Our analysis, however, demonstrates that light …
Effects Of Blue Light At High Photosynthetic Photon Flux, Saundralyn G. Rhoades, Kevin R. Cope, Chase Snowden, Bruce Bugbee
Effects Of Blue Light At High Photosynthetic Photon Flux, Saundralyn G. Rhoades, Kevin R. Cope, Chase Snowden, Bruce Bugbee
Controlled Environments
No abstract provided.