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Table II-3. Estimation of initial investment and operating costs (in U.S. dollars) using incandescent (INC), high-pressure sodium (HPS), or red+white+far-red light-emitting diode (LED) lamps for 4-h night-interruption lighting in a 4,320-square-foot (30×144 feet) greenhouse with 7-foot clearance above the growing surface. Data for INC and HPS lamps are adapted from Fisher and Both (2004). Number of fixtures per greenhouse Area per fixture (square feet) Fixture cost Bulb cost Bulb lifetime (h) Initial fixture and bulb cost per square foot Electricity costs (including ballast) Electricity used per square foot per week (kWh) Electrical cost per square foot per week (at $0.1029/kWh) Bulb costs Time operated per week (h) Bulb life (wk.) Bulb cost per square foot per week Bulb cost per greenhouse per week Total operating cost Total operating cost per square foot per week Total operating cost per greenhouse per week INC (150 W) 39 111 $5.31 $1.77 750 $0.06 0.0379 $0.0039 28 27 $0.0006 $2.56 $0.0045 $19.41 HPS (250 W) 10 432 $168 $32 12,000 $0.46 0.0190 $0.0020 28 429 $0.0002 $0.75 $0.0021 $9.19 LED (14 W) 39 111 $5.31 $40 20,000 $0.41 0.0035 $0.0004 28 714 $0.0005 $2.18 $0.0009 $3.76 50PDF Image | LED REGULATE FLOWERING OF PHOTOPERIODIC ORNAMENTAL CROPS
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