The cultivation of vegetables and seedlings in early spring in the middle lane requires greenhouse lighting. According to the current standards plants must be under day or artificial light for at least 10-12 hours a day. Longer lighting is not recommended as it may adversely affect the development of plants.
To provide artificial light and vegetable seedlings in greenhouses on garden plots typically use fluorescent lamps as the most economical and gives spectrum of light, close to daylight.
Commercially available range of lamps and some of their characteristics are given in table 2.
Table 1. Technical characteristics of fluorescent lamps.
Table 2. Characteristics of the circuit elements for lamps of different power.