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Official manufacturer imagePetzl ACTIK CORE
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Official manufacturer imageFenix HM50R V2.0
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Questions before you buy
What does E39 mean on a headlamp listing?
The term by itself is ambiguous and does not verify a particular headlamp. It can appear as a fitting designation in lighting, so use the complete product and application details to identify the item.
Is an E39 bulb a headlamp?
An E39 designation alone is not a wearable headlamp model. Verify the exact fixture or vehicle application in its manufacturer documentation before selecting a replacement.
How do I find the right headlamp replacement for my vehicle?
Use the vehicle year, make, model, trim and manufacturer parts catalogue or manual. Match the complete approved part number rather than relying on a short code from a search result.
Can I use an E39 fitting in a wearable headlamp?
Do not assume so. Wearable headlamps use model-specific lamp and battery systems; follow the maker compatibility list.









