H9 Vs. H11 Headlight Bulbs

H9 Vs. H11 – The Difference Between These Headlight Bulbs

Many people confuse the H9 and H11 headlight bulbs to be the same bulb. Now although they are similar, they actually have different features and major changes when it comes to their performance. Which is why today, we are doing a H9 vs. H11 comparison.

‘What’s the difference between H9 and H11’ – you are asking yourself.

Well, on first glance, everything from the trim tab to the connector of both H9 and H11 looks similar. However, if you look more carefully – you will notice that the H9 has a tab at the top of the female side which is not present in the H11 headlight bulb. Also, the top lugs on each bulb are the identical in the H9. This is not the case in the H11 headlight bulb, where they are asymmetrical and opposite.

The performance of the H11 definitely overcomes the H9 headlight power – which is why the H11 comes as a great re-aim on your headlights.

As we continue with our H9 vs. H11 headlight comparison, we’d like to state that for the fog light, the H9 headlight bulb fits better with a slight modification. The whole ‘science’ behind all this is the performance in lumens. A H9 headlight bulb modification can give you 2100 lumens than the standard 1450 lumens, with only a 10-watt and 2-amp increase. The benefit from all this, though, will be a much brighter light than stock.

If you see more carefully, you will see that both of them consist of a base which can be trimmed. The portion of this base that should be trimmed measures around 3mm from left side of the top lug in order to allow the headlight bulb to fit in the top light housing. Also, the bulbs should be maintained with a debris which must be wiped down with a soft towel and 91% Isopropy in order to clean off the debris.

Update: HID Headlights are slowly being replaced by LED technology.  One of the better LED headlight kits we’ve come across is the XenonPro.  They make a great kit, and they’re a solid, reputable company.  Check them out!

H9 vs H11 headlight bulb

In case you want to use a regular H9 as your H11, you can always remove the tab top on the female side by using a small sharp chisel and a rubber mallet.

At last, we can come to a conclusion that  the H9 headlight bulb has a harder driven filament, no glare cap, higher wattage but also a shorter life. However, it remains a significantly higher output. Therefore, it is a significant upgrade you may consider.


Leave a Reply

Your email address will not be published. Required fields are marked *