yfin

I posted this up on an Australian forum - interested to see whether anyone else has tried this. Firstly, some background. I have read this chaps articles before and he seems to know everything there is to know about automotive lighting.

LINK

Look what he says about the H11:



H11 bulbs

These new single-filament 55w bulbs are quickly supplanting HB4/9006 in new low-beam headlamp and fog lamp designs. (They are not physically interchangeable with any 9000-series bulb!) As is the case with other bulb families—such as 9004/9007, 9005/9006, etc.—the H11 has different base keys than its H9 high-beam and H8 fog lamp counterparts. Somebody goofed on the spec, though, for the difference between H11 and H9 base keys is insufficient; it's too easy to install an H9 bulb where an H11 belongs. The difference in light output between these two designs is enormous (1350 lumens from the H11, 2100 from the H9), so putting an H9 in place of an H11 will obviously cause the lamp to produce a lot more light. Some lamps are designed such that the optics would handle the extra light well, without creating excessive glare for other road users. Many, however, are not. As with H8 and H9, H11 bulbs are not widely available in the aftermarket.



H9 bulbs

These new single-filament 65w bulbs are rapidly gaining popularity amongst automakers for use primarily in high-beam headlamps, often in conjunction with H11 bulbs for the low beams. H9 is an extremely high output design (2100 lumens) with an extremely white light color.
H9 bulbs are not physically interchangeable with any 9000-series bulb. As with H8 and H11, these are currently tough to find in the aftermarket.


So following what Mr Stern says - a H9 fog bulb should fit a H11 application giving off 2100 lumens instead of 1350 yet only draw 65w. I found this discussion on an Australian forum:

http://www.ls1.com.au/forum/showthread.php?t=34619

They rave about it on the LS1 forum - saying there is 50% more light with just changing to a H9 globe.

Is anyone prepared to try this? I am without my car until January (travelling) and very interested if someone with the fogs gives this a go. Post up some pics of your impressions and whether there were any fitment issues. On the LS1 forum they mention some minor changes to the globe socket.