> The exponentially falling costs of LED lights means that in another 10 - 15 years people will be able to cheaply grow marijuana indoors without the risk of getting caught by heat sensing helicopters or high electric bills.
No it won't. Fluorescent lights are already better (and always have been better) than LEDs in electrical efficiency.
"Perfect" efficiency for white light is 251 lumens/watt. A high quality fluorescent lamp does 100 lumens/watt. There isn't a lot of improvement available.
Assuming plants need monochromatic light then perfect is in the 600 range (it depends on the frequency), that still isn't a huge jump from the currently available 100.
No it won't. Fluorescent lights are already better (and always have been better) than LEDs in electrical efficiency.
"Perfect" efficiency for white light is 251 lumens/watt. A high quality fluorescent lamp does 100 lumens/watt. There isn't a lot of improvement available.
Assuming plants need monochromatic light then perfect is in the 600 range (it depends on the frequency), that still isn't a huge jump from the currently available 100.