Proceedings right light 2nd european conference on energy-efficient lighting. Fluorescent lamps have been replaced by metal halide lamps in the Martonvásár Phytotron. European Conference on Energy-Efficient Lighting [2, 26-29 Set. 1993, Arnhem].

Tischner, Tibor.

1993

530
CIENA

Twenty years ago, the light sources in the Martonvásár phytotron units consisted almost exclusively of fluorescent lamps. Developments in light sources are almost always aimed at improving condition for human vision. It is now a well-known fact, however, that the requirements raised by plants as regards both the spectrum and intensity of the light are quite different from those required by the human eye. This means that lighting developments can rarely be applied in plant growth chambers, and then only by a lucky chance. The development of metal halide lamps for colour television purposes can be regarded as one such lucky chance. The fact that these light sources have a spectrum very similar to that of natural light and can be used to achieve high levels of illumination means that, in addition to their original purpose, they are also well able to satisfy the criteria to be met in plant raising. In the late seventies, extremely encouraging results were obtained when metal halide lamps with rare earth additives (dysprosium, holmium, etc.) were tested in the Martonvásár phytotron. Similarly favourable results were also reported from other phytotrons and greenhouses were plants were grown under metal halide lamps. As a consequence of this, when the Martonvásár phytotron was renovated in 1990, the fluorescent lamps were replaced by metal halide lamps in the vast majority of the plant growth units. SUMMARY. INTRODUCTION. PLANTS AND LIGHT. FLUORESCENT LAMPS. METAL HALIDE LAMPS. LIGHT MEASUREMENTS. REFERENCES.

Presenta tbls.

HUNGRIA; ILUMINACION; LAMPARAS; CAMBIO TECNOLOGICO; VENTAJAS; LAMPARAS FLUORESCENTES;