The light emitted contains more usable radiant energy. One or two incandescent bulbs may be used with the fluorescent tubes. Standard incandescent bulbs alone are not recommended as a light source because of their poor light spectrum and the heat they produce. Specially designed incandescent spotlights are available for plants in 75 and 150 watts. They provide useful levels of light energy when located about 12 to 18 inches away from the plants.
Healthy violets require proper temperature, light and humidity.
The leaves may curl down, cup and become brittle. Flowers may be deformed and discolored. Also foliage maybe a light green at cooler temperatures, especially when grown under correct light conditions. Plants growing in drafts or touching glass window panes may have injured foliage. Humidity Humidity, or the amount of water vapor suspended in air, is important to good violet growth.