Metal halide lamp 400W GIB Lighting Growth Spectre MH. Metal halide lamp (blue-white light) is suitable for the growth phase. The stems of the plants will thicken, the leaves will grow larger and stronger. The plant will acquire a healthier and richer green color. Suitable for all plants that do not like shade. Luminous flux of the Gib Lighting Growth Spectre 400W lamp: 35000lm. E40 socket.