Though LEDs (light emitting diodes) have been around since the early 1960s, they were not able to produce the wide spectrum of color they’re now known for until later on.
LEDs were also very expensive, making them an unreasonable option for grow lights compared to HID (high intensity discharge).
With today’s demand for energy-efficient lighting, however, LEDs have dropped in price and increased in quality.
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Trevor Hennings ~ Leafly.com ~