Join Date: Feb 1999
Location: Belle Mead, NJ USA
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The better, more efficient light path of the G11's makes them somewhat brighter. However, another issue that's been discussed is that older G10's & clones are less susceptible to shading issues in general than G11's. The more advanced light path tends to make shading problems more visible.
The 'old' original G10 bulbs had a larger arc spacing that made them lose brightness faster than the newer G11 bulbs with shorter arcs. Fortunately, the newer G11 bulbs can be fitted into G10's when the time comes.
I'd check with the seller to see if there's any stuck on pixels. They can be distracting, to say the least.
Equipped with an crt projector optimized room, I couldn't justify the added expense for the brightness difference.