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 SAE, DIN, 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.

Last Updated on August 19, 2020