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| Understanding HID Bulbs | HID Bulb Comparisons |
To learn more about HID lighting read our buyer's guide. HID Lighting Buyer's Guide. Also check out our HPS Bulb Comparison Review to find the best value bulb for your garden. Metal Halide (MH) bulbs should be used for the vegetative phase. MH bulbs give off a blue to white spectrum
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HID - High Intensity Discharge Lights
HID grow light bulbs are a sealed tube filled with gas that creates light when the gas is ignited by two electrodes that arc current between them.
MH - Metal Halide
MH grow light bulbs should be used for the vegetative phase as they give off a blue to white spectrum
HPS - High Pressure Sodium
HPS has a red or orange tint and is used primarily in the flowering phase of your plant's life.
CMH - Ceramic Metal Halide
CMH grow light lamps are a relatively new source of HID light that is a variation of the traditional Metal Halide HID lamp.
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