Plant growers are interested in LEDs because they are more energy efficient, emit less heat (can damage plants close to hot lamps), and can provide the optimum light frequency for plant growth and bloom periods compared to currently used grow lights: HPS (high pressure sodium), MH (metal halide) or CFL/low-energy. However, LEDs have not replaced these grow lights due to higher price. As mass production and LED kits develop, the LED products will become cheaper.
As we know, the HPS, Incandescent Lamp and Fluorescent Lamp emit all the spectrum of visible light & some sightless light, but LED Grow Lights only deliver the colours of light used by plants for efficient and healthy growth!
LED Grow Lights are the newest and most efficient way to grow plants indoors! This revolutionary form of light is different from other traditional lights, such as High Pressure Sodium (HPS) or Metal Halide (MH). LED Grow Lights bulbs are comprised of multiple low-watt light sources, working together on a single board. HID lighting is extremely inefficient; it generates a lot of heat while only producing 30% photosynthetic light. Unlike HIDs, 1W LED emit very little heat because all the power is efficiently converted into targeted light wavelengths for plants. For this reason, additional fans, ducting and AC are rarely if ever necessary. Additionally, LEDs will last 50,000 before they've lost even 30% of their initial output, not to mention they're still 100% functional! So there is no need for yearly or bi-yearly bulb changes, as 50,000 hours is 6 solid years, and after that you can still continue using the light! Lastly, LED grow lighting use 65-70% less energy than traditional HID lighting, while producing the same or better results. With no additional cooling costs, bulb costs, and decreased electrical costs every month, imagine what you can do with the extra money!
A 90W LED UFO Grow Light produces as much light as a standard 400W HPS (High Pressure Sodium) light. According to the US Dept. of Energy, the average price of power is 10.7 cents per kilowatt-hour. For one year of use (12 hours per day) a 400 W HID light adds $187.46 to your bill while a 90W LED Light adds ONLY $42.18!! That’s nearly 80% less!!
Efficiency: LEDs emit more light per watt than incandescent light bulbs. Their efficiency is not affected by shape and size, unlike fluorescent light bulbs or tubes.
Color: LEDs can emit light of an intended color without using any color filters as traditional lighting methods need. This is more efficient and can lower initial costs.
Size: LEDs can be very small (smaller than 2 mm2) and are easily populated onto printed circuit boards.
On/Off time: LEDs light up very quickly. A typical red indicator LED will achieve full brightness in under a microsecond. LEDs used in communications devices can have even faster response times.
Cycling: LEDs are ideal for uses subject to frequent on-off cycling, unlike fluorescent lamps that fail faster when cycled often, or HID lamps that require a long time before restarting.
Cool light: In contrast to most light sources, LEDs radiate very little heat in the form of IR that can cause damage to sensitive objects or fabrics. Wasted energy is dispersed as heat through the base of the LED.
Slow failure: LEDs mostly fail by dimming over time, rather than the abrupt failure of incandescent bulbs.
Lifetime: LEDs can have a relatively long useful life. One report estimates 50,000 hours of useful life, though time to complete failure may be longer. Fluorescent tubes typically are rated at about 10,000 to 15,000 hours, depending partly on the conditions of use, and incandescent light bulbs at 1,000–2,000 hours.
Shock resistance: LEDs, being solid state components, are difficult to damage with external shock, unlike fluorescent and incandescent bulbs which are fragile.
Focus: The solid package of the LED can be designed to focus its light. Incandescent and fluorescent sources often require an external reflector to collect light and direct it in a usable manner.
Hydroponics, Horticulture, Greenhouse Lighting, etc