Bulb Replacement Guide: Festoon Bulbs

This is auxiliary data supporting  Volvo Bulb Guide and Cross-Reference topic in the Volvo forum.

Festoon Bulbs

Festoon Bulbs usually are Double-Ended (DE) devils often vary by base (cap size), length and diameter even among same voltage and wattage. Even with SAEDIN, and ECE variations, this should help narrow things down* and rule out numbers for other voltages. The 1.2W vanity mirror bulb is conspicuously absent and non-standard.

Volt Watt Base Osram Length* Dia. Notes
6 V 3 W SV7-8 6427 29 mm 9 mm
6 V 5 W SV8,5-8 6416 35 mm 11 mm ECE: C5W
6 V 10 W SV8,5-8 6450 41 mm 11 mm Form K (DIN 72601, Part 4)
6 V 18 W SV8,5-8 6470 41 mm 15 mm Form K (DIN 72601, Part 6)
12 V 3 W SV7-8 6428 31 mm 9 mm
12 V 3 W SV7-8 DE3021 41 mm 9 mm
12 V 5 W SV7-8 DE3022 41 mm 9 mm
12 V 5 W SV8,5-8 6418 35 mm 11 mm ECE: C5W
12 V 5 W SV8,5-8 6413 41 mm 11 mm
12 V 5 W SV8,5-8 DE3423 41 mm 11 mm
12 V 10 W SV8,5-8 6438 31 mm 10 mm
12 V 10 W SV8,5-8 6461 36 mm 11 mm
12 V 10 W SV8,5-8 DE3425 41 mm 11 mm
12 V 10 W SV8,5-8 6411 41 mm 11 mm 7576, Form K (DIN 72601, Part 4)
12 V 10 W SV8.5-8 DE3175 41 mm 11 mm
12 V 18 W SV8,5-8 6475 41 mm 15 mm 7593, Form K (DIN 72601, Part 6)
12 V 21 W SV8.5-8 6476 43 mm 15 mm ECE: C21W
24 V 3 W SV7-8 6430 28 mm 8 mm
24 V 3 W SV8,5-8 6421 41 mm 11 mm
24 V 5 W SV8,5-8 6423 40 mm 11 mm ECE: C5W
24 V 5 W SV8,5-8 6424 41 mm 11 mm
24 V 10 W SV8,5-8 6429 41 mm 11 mm
24 V 18 W SV8,5-8 6480 41 mm 15 mm 7595, Form K (DIN 72601, Part 6)
24 V 21 W SV8,5-8 6460 45 mm 15 mm ECE: C21W

* Length descriptions can vary by 4mm or more due to some measuring tip to tip, others like ECE use mid-tip-to-mid-tip where the bulb holder contacts rest, some listing what the bulb actually measures where as others list the MOL and MOD though the actual bulb may be smaller. Recommend taking old bulb in with a metric ruler into store for comparison when buying replacement.

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