Marc, I agree that it is fun to discuss theories.

I understand your point about diminishing returns with the CFL lighting reflectivity.

But you basic statement is incoorect when you say, "...if we think that the light from cfl's is pretty much junk after a few inches...".

I am certainly not one that thinks that.

Emphasis is placed on the close proximity between light source and plant top with CFL lighting, only because WE CAN get that close.

However, that doesnt mean the light is useless if it is not that close, or, useless once it has passed its destination, or has been absorbed.

Since the CFL's are able to be kept cool, we simply take advantage of that and move the lights closer and hence recieve optimal node length and compact foilage.

The light returning from the reflective source is critical, even though it may not be directly involved in growing substantial vegetation.

Having the reflection, that is impossible to get with black walls, aids in lighting the undersides of the foilage, and also penetrates the canopy.

While this may not serve as ample lumens to grow large leaves, it still provides the plant leaves with the energy it needs to power the entire plant as a whole.

Plants use light as their power source...so even though the reflected light may not shine as bright as the source....having the light there PREVENTS defoilage later on when the canopy has become too dense to allow ample light penetration.

You should definitley have the entire grow room be one massive reflective area. The light will bounce indefinitely until the light energy has been dissapated into another energy form.

Having them there will do more to PREVENT DEATH or light deprivation than anything else, but it also, powers the ENTIRE plant by providing needed light to all foilage.

That alone is worth their value and demand their useage when appropriate...ie...when flowering

Other thoughts?