Another consideration is that you've got to put the plant directly in the middle so you can get the best effect for your orchid lighting. Metal Halide lights and sodium lights are two kinds of HID or high intensity discharge lights that give your plants more brightness for less space. These more 'high-tech' lights do come with a higher cost so it's not practical for the simple home grower but they do serve the need of giving your orchids the red or blue light it needs to ensure flowering or growth. Combining these types of orchid lighting can make you enjoy your orchid growing experience even more.