T8 bulbs are powered by an electronic ballast compared to the magnetic ballast that the T12s are traditionally powered by. In comparison, T12 bulbs can lose 20 percent, or double the T8 after the same number of hours. T8 bulbs have a slower period of decrease, losing only 10 percent of their initial brightness after 7,000 hours of use. Over time fluorescent bulbs begin to lose their intensity and brightness. A T8 bulb is 32 watts, while a T12 bulb is 40 watts, so this his makes the T8 bulb more energy-efficient. A T8 bulb produces around 2600 lumens, while the T12 bulb puts out just over 2500 lumens. The T8 bulb is slightly brighter than the T12. T8 bulbs are eight eighths of one inch, or one inch in diameter, while T12 bulbs are twelve eighths and have a larger diameter of one and a half inches. The number 8 or 12 refers to the difference in the diameter of the bulb. So the primary difference between T8 and T12 fluorescent bulbs is the size of the bulbs and their bases. #Circular studio light freeTechnology has given us a new smaller, brighter, energy efficient and flicker free bulb ( T8) that eliminates many of the obstacles that we faced with the older style (T12) bulbs that most of us grew up with. The more expensive Kino Flo lights use a different type of ballast that allows them to operate at a higher than standard lamp current and a higher frequency, hence eliminating the flicker. This happens fast enough that we generally don’t see it with our eyes, but since the camera’s shutter works at a very fast speed, over the course of several frames you will notice that not only does the exposure change, but the color quality also changes due to the pulsing of the light. Because of the pulses, the lights are rapidly turning on and off. You see, fluorescent bulbs are gas filled tubes the gas is charged by electric pulses from a ballast which in turn creates visible light.
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