34+ T8 Vs T12 Bulbs. T12 bulbs have largely been phased out as more energy efficient lamps have come to the market. You've also addressed the issue of reduced ballast life in electronic ballasts vs the magnetic ballasts.
Although the t8 puts out slightly more light, the difference is not noticeable to the human eye. T12 bulbs are simply an older technology that arose back in the 1940's which was a big step forward in lighting. We are using the 6500 k bulbs for the the discussions of rapid vs instant start effect on bulb life of t8 vs t12 were enlightening.
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I've heard different contradicting things about whether t8 and. A wide variety of t8 or t12 bulbs options are available to you, such as there are 32 suppliers who sells t8 or t12 bulbs on alibaba.com, mainly located in asia. 4 bulbs in a fixture with t5. While traditional light bulbs, like incandescent light fixtures and fluorescent tubes are still in play, many people are switching to led lights, led tubes, and other led light fixtures.