J1/57 6.6a is a 45W 6.6a Osram 64321 4008321106360, 6123 58323 Narva lamp is 45W with g6.35 base. The Sylvania L2511 is no longer available. 45W 6.6a with g6.35 base. The average life hours is 1500 hours for the Osram.
Osram 64321 4008321106377
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