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I have seen it happen where a concentration of heat on a thin glass
panel, and a an uneven stress, caused by lifting or bending, can
promote a break. Usually such a break will occur at a point where a
hairline crack has been been started somewhere along the edge of the
glass. The hairline might go unnoticed for a long time until the right
combination of uneven heating and weight is applied.
But generally speaking, the heat of high wattage lamps, whatever the
type, is not sufficient to cause a break.
If the glass is replaced on the same tank with the same set up, the
break is unlikely to recur.
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