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Spectral distribution of dimmed high intensity discharge lamps in a plant growth facility

, : Spectral distribution of dimmed high intensity discharge lamps in a plant growth facility. Agronomy Journal 71(3): 513-515

A commercial dimming ballast system for high intensity discharge (HID) lamps was tested for use in plant growth chambers. The dimming ballast system can be controlled either manually at the dimming panel or by a d.c. voltage from a programmer or computer. Using the dimming system, photosynthetically active radiation can be continuously varied from about 200-about 2000 .mu.E m-2 s-1. The effects of dimming on the spectral intensity (400-750 nm) of 3 types of HID lamps measured individually and in combination to achieve a better spectral mix were described. The lamps used were 400 w metal halide, mercury vapor and high pressure sodium.

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