That's a great question, and totally depends on what you are looking for.
You get get a small fluorescent or LED for as little as $20, great for indoor
herb gardens or house plants. For more serious growers the price can be
anywhere from a few hundred to a few thousand dollars. For a break
down of the different types of lights and what they do, goto ledgrowlights.tk
This isn't an easy answer, because it depends on the type of grow light (fluorescent, HID, LED), the size of the garden, and also changes over time. I've suggested a link that discusses costs associated with grow lights.
the amount of light
The cost to run a 400 watt HPS light will depend on your electricity rate. On average, running a 400 watt HPS light for 1 hour will cost around $0.06 to $0.12. To calculate the monthly cost, multiply the hourly cost by the number of hours the light is on each day, then multiply by 30 days.
Most plants will grow in white light, as it is closer to blue light. Blue light is the light emitted from the sun for the majority of the day. Green light has a very small place on the spectrum and therefore does not appear much. However, if the plant is hardy, it may grow in any light or even no light.
Generally, plants do not grow well in green light as the green portion of white light is reflected (this is why plants appear green), if a plant was subject to only green light it wouldn't take in as much light energy because it would be reflected, therefore, photosynthesis would not be carried out as efficiently as a plant subjected to white light.
This isn't an easy answer, because it depends on the type of grow light (fluorescent, HID, LED), the size of the garden, and also changes over time. I've suggested a link that discusses costs associated with grow lights.
LED grow lights have a longer useful life than fluorescent lights, as long as 15 years for some fixtures, and thus a lower "total cost of ownership." The total cost of ownership includes the cost to buy the light, use it, and replace expired bulbs. One manufacturer estimates that the total cost of owning an LED grow light over five years is about half the cost of a comparable fluorescent lights.
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the amount of light
$100
shooobeeharifnee
A customer can purchase a 1000 watt grow light from a website called Greners. The cost to purchase a 1000 watt grow light from the Greners website is around an average of $500.00
alot
quite alot usually
a pickle and a left nut
1.00
mine costeD me 4633.56$