The PG1 and PG2 products have a somewhat messy kind of assembly that is not easy to work with when trying to replace internal parts in the field. Accessories can be added or replaced, but any request to replace drivers or light engines should not be accommodated. The fixtures should be replaced as complete units only. Also, since these are available on the shelf in most popular configurations they are quicker to replace as complete fixtures. The mounting plate is also made for quick mounting so that will also help to support this recommendation.
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