The PAR38 30 W bulbs are used in pairs over two separate areas that are about 2 feet wide by 3 feet long. The one area is for some Paphs (farther away from bulbs) and the other have some Cattleyas (tops are about 6-8 inches away). What area you can cover will depend on the type of plants you are trying to grow. With the 100 degree lens that I have on these bulbs, the area of illumination is fairly wide, but the intensity falls off at the perimeter fairly quickly.
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