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Indoor gardeners can choose from several types of grow lights. High-intensity discharge (HID) types are the brightest and come as metal halide bulbs, good for leaf growth, and high-pressure sodium bulbs, which are better for flowers. High-intensity fluorescent lights use the same fixtures as HID lights, but are less expensive.

Whether growing plants in a greenhouse or indoors, the right combination of cool and warm grow lights ensures indoor gardeners overcome the lack of natural sunlight and grow healthy plants.