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Ah Steve.....it is a 100w bed.....
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Oops... sorry. My bad. I didn't read post # 19 & 21 carefully.
So - the 7.5% is more typical of 100W systems. Thus (hence™) if the bed was designed for "R" tubes (close together) and they are not mixed up backwards... I have no idea whay they are striping so bad.
Any NEW lamps should be cut back a bit until they age past ~100 hours.... but unless they are totally uncompatible with OEM tubes then the mystery continues........