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#1958321 - 07/19/10 07:40 AM H11 to H9 conversion
Hokiefyd Offline


Registered: 06/24/04
Posts: 14505
Loc: Top of Virginia
I have read a few DIY pages instructing on how to trim an H9 bulb to fit into an H11 slot. The nominal difference in lumens (2100 vs. 1200 as I recall) is non-trivial, with the associated loss in life, and 10W increase in power (about 0.9 amps at 12V).

I am considering doing this in my Camry's low beam projectors, but am concerned about heat. I have read on a Camry board the suggestion that 55W HID kits have burned the chrome off the inside of the projector, so when folks ask about HIDs, they get recommended the 35W kits. The H11 bulbs are already 55W, so I'd think that installing 65W bulbs would make the projectors even more prone to damage, unless I don't understand how HID filaments work. Would a 55W HID filament burn at a higher physical temperature than a 65W halogen bulb?

Does anyone have any experience running an H9 in place of an H11? I'm not at all new to trimming bulbs (I've worked a lot with trimming 9005s and HIRs). I'm just looking for some real world experiences with any heat-related issues, especially in the relative confines of a projector housing.

Thanks!

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#1966434 - 07/26/10 06:58 PM Re: H11 to H9 conversion [Re: Hokiefyd]
UG_Passat Offline


Registered: 05/27/08
Posts: 1516
Loc: NJ
had no issues running H9 in place of H11 on my passat fog lights.

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#1966794 - 07/27/10 07:00 AM Re: H11 to H9 conversion [Re: UG_Passat]
Hokiefyd Offline


Registered: 06/24/04
Posts: 14505
Loc: Top of Virginia
Does your Passat use relatively small "projector" fog lights? I think some VWs do. If yours does, then I'd be pretty comfortable with the switch. Thanks!

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#1966968 - 07/27/10 09:25 AM Re: H11 to H9 conversion [Re: Hokiefyd]
UG_Passat Offline


Registered: 05/27/08
Posts: 1516
Loc: NJ
Originally Posted By: Hokiefyd
Does your Passat use relatively small "projector" fog lights? I think some VWs do. If yours does, then I'd be pretty comfortable with the switch. Thanks!


The "small ones" on the older VW's uses H3 bulbs.

My passat does use relative compact projector fog lights

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#1967024 - 07/27/10 10:18 AM Re: H11 to H9 conversion [Re: UG_Passat]
Hokiefyd Offline


Registered: 06/24/04
Posts: 14505
Loc: Top of Virginia
Okay, thanks. I may go ahead and try this.

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#1968159 - 07/28/10 09:20 AM Re: H11 to H9 conversion [Re: Hokiefyd]
A_A_G Offline


Registered: 06/13/08
Posts: 279
Loc: D-town
I did the h11 to h9 conversion on my 08 xb (lows and fogs) and I've had no problems so far in 8 months.


Edited by A_A_G (07/28/10 09:20 AM)

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#1980520 - 08/09/10 09:28 AM Re: H11 to H9 conversion [Re: A_A_G]
Hokiefyd Offline


Registered: 06/24/04
Posts: 14505
Loc: Top of Virginia
Thanks A_A_G. Did you notice a significant improvement in lighting?

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#2029053 - 09/27/10 09:30 AM Re: H11 to H9 conversion [Re: Hokiefyd]
Hokiefyd Offline


Registered: 06/24/04
Posts: 14505
Loc: Top of Virginia
As a follow-up, I installed the H9 bulbs in my H11 projectors last night. Holy cow, what a difference. I'm feeling a little self-conscious about the light now...it's so much brighter. The optics are still well-controlled, though. The difference in color is nice as well. The light is rather white. The H11 bulbs that came out of my Camry were Philips H11 LL, so they were Long Life bulbs (probably slightly dimmer and yellower than standard H11 bulbs). The new H9s are Sylvania standard H9, but they were made in Germany and stamped OSRAM.

Next time, I may try the H11 XV, which are also OSRAM units made in Germany.

The H11 XVs are $23 for a pair at Pep Boys. I paid $14.99 each for the H9s at Auto Zone.

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#2030339 - 09/28/10 12:00 PM Re: H11 to H9 conversion [Re: Hokiefyd]
Hokiefyd Offline


Registered: 06/24/04
Posts: 14505
Loc: Top of Virginia
Update 2: I took the bulbs back out. I can't count how many positive reports I've read of folks using these bulbs, but after I drove last night with the lights on, the backs of the bulbs (where the plastic connector is) were so hot, you couldn't touch them.

So I threw the H11s back in it this morning and drove to work with the lights on again and though the backs of the bulbs were pretty warm, they didn't burn my skin, and I could leave my finger on them for a good 5 seconds. There's a difference in the running temperature of the bulbs, and though I don't know how much it is or if it's significant to the housings or the wiring, I'm not quite comfortable with it.

So I'm going to switch back to the H11s, probably the H11 XVs that I can get at Pep Boys for $23 for the pair.

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#2031557 - 09/29/10 12:18 PM Re: H11 to H9 conversion [Re: Hokiefyd]
A_A_G Offline


Registered: 06/13/08
Posts: 279
Loc: D-town
I think you would have been alright, I'm going near 1 year with mine.

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#2031627 - 09/29/10 01:01 PM Re: H11 to H9 conversion [Re: Hokiefyd]
Hokiefyd Offline


Registered: 06/24/04
Posts: 14505
Loc: Top of Virginia
Probably. I just didn't feel comfortable with them in there. Also (as noted in another thread), the upward lighting on my projectors that normally light reflective road signs was really increased with the H9s, almost to the point of being distracting. Do the projectors on your Scion have the "squirrel spotters"?

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#2032404 - 09/30/10 06:58 AM Re: H11 to H9 conversion [Re: Hokiefyd]
A_A_G Offline


Registered: 06/13/08
Posts: 279
Loc: D-town
Yeah I have the squirrel finders in my projectors. The upward lighting doesn't really bother me. I'm guessing because prior to the h9 conversion I had hids.

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#2032568 - 09/30/10 10:02 AM Re: H11 to H9 conversion [Re: Hokiefyd]
sciphi Offline


Registered: 03/24/07
Posts: 10008
Loc: Upstate NY
Throwing a relay harness at the bulbs may get you relief from the high temperatures. The stock wiring is often pathetically inadequate for regular bulbs, much less a more powerful bulb.
_________________________
2013 Toyota RAV4 XLE
2012 Chevrolet Cruze Eco

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#2032743 - 09/30/10 01:20 PM Re: H11 to H9 conversion [Re: Hokiefyd]
Hokiefyd Offline


Registered: 06/24/04
Posts: 14505
Loc: Top of Virginia
Wouldn't more current just mean HIGHER temperatures at the bulb? I'm talking about the temperature of the back of the bulb itself, not the wiring. The wiring felt fine to the touch.

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#2033620 - 10/01/10 09:21 AM Re: H11 to H9 conversion [Re: Hokiefyd]
A_A_G Offline


Registered: 06/13/08
Posts: 279
Loc: D-town
Have you ran your high beams on and then touched the back side of the bulb? The 9005 beams run the same wattage, I don't see why there would be a problem running h9s in the low beams.

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