t12 bulb

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It should be easy to find at a hardware store, building supply like Hone Depot, or an electrical supply store. Look for one that has a colour temp in the 5000K to 6500K range the latter are usually called "Daylight" and the former "Natural Sun". As well, look for a high CRI number. The colour temp and CRI (Colour Rendition Index) will be on the wrapper or even right on the tube. Buy whichever has the higher CRI. T12 fixtures may have gone out of production, but tubes are still readily available.
 
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