The J1/58 is capsule type halogen lamp with 100W and 6.6a available from Osram as 64346 4008321106384 or 6343 58343 from Narva. The J158 lamp is 100 Watt, 6.6 amp with a g6.35 base. The Sylvania L2513 is no longer available. 100W 6.6a with g6.35 base. This J1 58 halogen airfield lamp is compact and bright therefore performs perfectly for airfield lighting with an average life hours of 1200 hours for the Osram 4008321106391.
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