INTRODUCTION

LED light source allows to accelerate plant grow and increase harvest. It is even possible to regulates plant grow and bloom time. Unlike any other kind of artificial light sources, LED light sources have specially matched spectrum for specific plants. LEDs are fully controllable, so it is possible to change spectrum with just couple of different LEDs. This increases efficiency of horticulture and planning harvest. Additionally LEDs may generate more light and less heat then sodium lamp, allow to light up side or bottom of plants. LED light sources are used in artificial plantation without daylight, so plants may be breeding almost everywhere.