Quote:
Originally Posted by freeztar
In other words, if I take a flashlight and shine it through a blue lens, I am changing the wavelength of the light, and hence I see blue on the other side. Correct me if I'm wrong.  |
You are correct...partly. In the flashlight scenario, the 'full' spectrum of the flashlight itself is dependent on the filament material and other particulars of the bulb; making the addition of the blue lens is actually a subtractive process in terms of color, i.e. the filter blocks all colors but blue. Light intensity drops and heat goes up in the bargain.
The various 'grow' lights we are discussing are using an additive process to get more colors, not subtractive filtering. They either add different gases to the bulb (e.g. sodium),or coating the interior of the bulb/tube with different mixtures of fluorescent minerals.
Oiu/no, mon ami?
