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There is real science about this so we do not need to speculate and those lower buds are the result of a full spectrum light with lots of photon energy being emitted. A photon will bounce around until it is absorbed and gives up its energy, mostly as heat. If you have a highly reflective environment they will bounce around more and more of them will hit the plant from different angles to be absorbed by the plant. This is regardless to the frequency (color) of the photon. Where this penetration idea comes from is that many lights have narrow frequency bands IE. red or blue. Photons emanating from a narrow band will have similar energy and will be absorbed at a similar given layer in the canopy. Red and Blue are absorbed high in the canopy (assumes poor reflectance in the space). Green light actually penetrates deeper then the rest and there is evidence that it is utilized by the plant. If your light does not have any green light then the bottom leaves are not getting much light. Ok so if you have poor reflectance, Low energy and narrow spectrum light Blue/Red then removing the bottom growth will have little effect on the growth of the plant but if you have high reflectance and or full spectrum light only prune the lower growth for air circulation. Air movement is important to prevent molds and bud rot. In most cases those lower leaves and buds are getting more light than you think.