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CHAPTER ONE Natural radiation in the winter
CHAPTERTHREE Lamps for supplementary lighting
CHAPTER FOUR Factors affecting the efficacy of supplementary lighting systems
APPENDlX artificial light Begonia Calceolaria Capenhurst cent chrysanthemums crop cucumber daylength effect efficiency electrical efficiencies Electricity Board emission emission spectrum energy far-red Figure fluorescent lamps fluorescent tubes given GLS lamps greenhouse grower growing rooms height and spacing high-pressure mercury discharge high-pressure sodium lamp HLRG horticulture illuminance levels incandescent lamps increasing internal reflector irradiance lamp mounting lamp types lamps for night-break leaf lettuce light output light sources light values lighting system lighting treatment lit area Littlewick Green long-day lighting long-day plants long-day treatment low illuminance low-pressure sodium lamp luminaire lx see Table MB/U MBFR/U lamps mercury lamp Midlands Electricity Board minimum illuminance mounting height night night-break lighting normally Philips Electrical Ltd photocell photomorphogenesis photoperiodic lighting photosynthetic phytochrome plant response produced radiant flux radiation relatively rows seedlings soil blocks SON/T lamps SOX lamps spectrum suitable supplementary lighting scheme technique temperature tomatoes University of Reading wavelengths