This kind of plant injury is called desiccation. It is critical that broadleaf evergreens have an adequate supply of soil moisture going into winter. The three aspects of light that affect plant growth are quality, quantity and duration. Quality Light is made up of wavelengths. Sunlight consists of a wide range of wavelengths, some of which cannot be seen by the human eye.
Artificial light can come close to duplicating the full range of wavelengths found in sunlight.
One warm white and one cool fluorescent bulb used together will come close to producing the full spectrum of light wavelengths for indoor growing. Special grow lights also produce this quality of light. Incandescent lights produce an adequate quality light, but their heat may damage plant tissues. Quantity Quantity describes intensity or concentration. The quantity of light decreases with distance and angle from the source.