העתק נול הפחתה how much wats emit led throu heat מרי בקבוק חיבור
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If more energy efficient light bulbs use 20% less energy than conventional light bulbs, then how do they work? Is it still true that heat emits light? - Quora
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Grow Lights: How Many Watts Per Plant/Square Foot is Needed? - Trimleaf
LED Grow Lights - The Myth About Watts - Garden Myths