Guides

Guides

Fitment and swap notes for Headlight Size. Written for DIY owners who want the right lamp the first time.

• Halogen Headlight Bulbs ExplainedLearn how halogen headlights work, compare them with LED and HID options, and decide whether standard halogen is enough for your vehicle.
• Types of Car Light Bulbs ExplainedLearn the differences between halogen, LED, HID, incandescent, and sealed-beam car bulbs, plus practical checks for safe replacement.
• 1156 vs. 1157 Bulbs: Single-Contact vs. Dual-ContactLearn the difference between 1156 and 1157 bulbs, including contacts, filaments, socket fit, vehicle checks, and LED replacement tips.
• 7440 vs. 7443 Bulbs: Choose the Correct Wedge BulbCompare 7440 vs. 7443 bulbs, learn the filament and socket differences, and check the correct wedge bulb before replacing it.
• 3157 vs. 4157 Bulbs: Interchangeability and Fitment GuideCompare 3157 and 4157 bulbs, including fitment, base design, terminal layout, color, wattage, and practical interchangeability checks.
• 3157 vs. 3057 Bulbs: Choosing the Right Brake and Turn Signal BulbCompare 3157 vs. 3057 bulbs for brake and turn signals. Learn about fit, dual filaments, electrical ratings, and installation checks.
• 9006 vs 9012: Upgrade Compatibility GuideCompare 9006 and 9012 bulbs, including fitment, base modifications, wiring, beam pattern, and checks before attempting a 9012 upgrade.
• 9005 vs 9011: Benefits, Fitment, and CompatibilityCompare 9005 and 9011 bulbs, including brightness, fitment, socket changes, wiring checks, beam aim, and practical compatibility advice.
• H11 vs H11B: Understanding the Fitment DifferencesH11 and H11B look similar but may differ in base keying, connectors, and optical alignment. Learn how to verify fitment before buying.
• H1 vs H7 Bulbs: Choosing the Correct Headlight BulbCompare H1 vs H7 bulbs, including base, connector, wattage, and fitment checks to avoid forcing the wrong bulb into your headlight.
• H4 vs. H7 Bulbs: Differences, Fitment, and Replacement ChecksLearn the key differences between H4 and H7 bulbs, including filaments, connectors, fitment, beam functions, and practical replacement checks.
• 9006 vs H11: Bulb Fitment and DifferencesCompare 9006 and H11 bulbs, including bases, connectors, typical uses, wattage, fitment checks, and safe replacement tips for DIY drivers.
• 9005 vs H11: Compatibility and Replacement Guide9005 and H11 bulbs are not direct replacements. Compare their bases, wattage, beam use, and practical checks before attempting a swap.
• 9005 vs. 9006 Bulbs: Differences, Fitment, and InterchangeabilityCompare 9005 and 9006 bulbs, including beam function, wattage, fitment, interchangeability, and checks before installing a replacement.
• H8 vs. H9 vs. H11: Bulb Differences and Fitment GuideCompare H8, H9, and H11 bulbs by wattage, output, fit, and safety. Learn how to confirm the correct bulb before swapping.
• Are H11 and H8 Bulbs the Same?H8 and H11 bulbs look similar but are not the same. Compare wattage, fit, heat, and safe compatibility before swapping either bulb.
• Headlight Bulb Equivalent ChartCompare common headlight bulb equivalents, including H4, 9003, HB2, H13, 9008, 9005, 9006, and more, with practical fitment checks.
• Headlight Bulb Cross-Reference GuideLearn how to cross-reference headlight bulb standards, compare bases and ratings, verify LED swaps, and avoid fitment or beam-pattern problems.
• Can I Use a Different Bulb Size in My Car?Learn when a different headlight bulb size is safe to use, how to verify fitment, and why base, wattage, beam pattern, and legality matter.
• What Does HB4 Mean? HB4 and 9006 ExplainedHB4 usually means 9006. Learn the designation, equivalent bulb numbers, differences from 9005 and H11, and how to confirm fitment.
• What Does HB3 Mean? HB3 and 9005 EquivalentsHB3 is commonly the same bulb as 9005. Learn what the designation means, how it differs from HB4/9006, and how to confirm fitment.
• 9000-Series Headlight Bulbs ExplainedUnderstand 9004, 9005, 9006, and 9007 headlight bulbs, including beam functions, HB cross-references, fitment checks, and installation tips.
• H-Series Headlight Bulbs ExplainedCompare H1, H3, H4, H7, H8, H9, and H11 bulbs, including filament designs, bases, fitment checks, and safe replacement tips.
• How to Read a Headlight Bulb NumberLearn how to decode H7, H11, 9005, 9006, and other headlight bulb numbers, then verify the base, position, wattage, and bulb type.
• Are Headlight Bulb Sizes Universal?Headlight bulb sizes are not universal. Learn how to check base, connector, wattage, dimensions, and beam position before swapping bulbs.
• Automotive Light Bulb Size ChartUse this automotive light bulb size chart to compare common headlight, fog, brake, turn signal, reverse, interior, and license plate bulbs.
• Car Bulb Sizes Explained: Complete GuideLearn how automotive bulb sizes, codes, bases, voltage, wattage, halogen, HID, and LED fitment work—and how to verify the correct replacement.
• Headlight Bulb Size ChartUse this headlight bulb size chart to compare H, HB, D-series, and LED designations and confirm the correct bulb before buying.
• How to Find Your Car Bulb SizeFind the correct car bulb size using your owner’s manual, vehicle lookup, old bulb markings, and practical fitment checks.
• How to Choose LED Headlight Bulbs That Stay Street-LegalChoose LED headlight bulbs safely: verify legality, match the housing, protect the beam pattern, and avoid common DIY installation mistakes.