growth you re after metal halide lighting is the type of hid lighting you need ... similar to the sun s rays in spring and summer metal ... halide lamps produce light which is mostly in the blue range of ... the light spectrum that s what you need to grow ... a high pressure sodium lamp by emitting light from the red-orange region of the ... spectrum this sort of hid lighting simulates the sun s light in fall ... plants under a high pressure sodium light think it s time to finish their growing ... the best of both worlds with just one light system hid lamp burning position ...