Light in the greenhouse. Drawing, description

TOOLS AND MECHANISMS FOR AGRICULTURE
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Light in the greenhouse. Drawing, description

Tools and mechanisms for agriculture

Directory / Tools and mechanisms for agriculture

Growing vegetables and seedlings in early spring in the middle lane requires greenhouse lighting. According to current standards, plants should be under daylight 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 to vegetables and seedlings in greenhouses in garden plots, fluorescent lamps are usually used as the most economical and give a spectrum of light close to daylight.

The range of lamps produced by the industry and some of their characteristics are shown in table 2.

Table 1. Technical characteristics of fluorescent lamps

Table 2. Characteristics of circuit elements for lamps of various powers

According to their characteristics, the lamps of the LDC and LD brands are the most suitable for lighting plants.

The usual scheme for switching on lamps (Fig. 1) does not allow using the full capabilities of lamps; the inclusion of an additional capacitor C2-4 uF in the circuit (for lamps LDC or LD with a power of 30 and 40 W) increases the light output of the lamp.

light in the greenhouse
Rice. 1. Standard circuit for switching on fluorescent lamps

light in the greenhouse
Rice. 2. Scheme of switching on fluorescent lamps with burnt filaments

Figure 2 shows a diagram of the inclusion of fluorescent lamps in which the ignition filaments have burned out. Characteristics of circuit elements for lamps of various powers are given in table 2.

Author: A.Vinogradov

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