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14 hour day 15 watt red 16 inch reflector 21 weeks 40 watt bulb 40 watt fluorescent 60 watt incandescent Angstrom units artificial light birds receiving birds were fed Birdseye 60 cents per bird chicks control pens Cornell University dark days difference in egg duction EFFECT OF VARIOUS effect on egg eggs per bird feed consumption FEED EFFICIENCY feeding periods Figure fluorescent lights foot candle FOUR WEEK PERIODS growing period hours of light increase egg production intensity of light lamps laying period light intensity light per day light period LIGHT RATIONING LIGHTED PENS maturity Michigan State University natural light Newcastle disease number of eggs percent PERCENTAGE EGG PRODUCTION pituitary gland poultry houses poultrymen RATIONED LIGHT red light red rays replicate reported roosts Single Comb White stimulation throughout the laying types of lights types of luminaries various lighting VARIOUS LUMINARIES watt incandescent bulbs watt red bulbs weeks of age