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tvodrd said:
Gtwace,
During the Li144430 project, I sent saphire warch crystals to the other participants. DougS aimed them (compared with mineral glass) at a lightmeter and found that they attenuated about 5% worse than mineral glassLarry
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Actually it was 4 +/-1% but you get the idea. Use Sapphire for its scratch resistance, not for superior transmission.