I would predict that you'll end up with awful beam patterns - H4 and 9004 bulbs don't have the filaments in the same position, so the lenses and reflectors optimised for one won't work well with the other.

James
Ottawa, ON

> Date: Sat, 16 Jan 2016 08:53:37 -0500
> From: kenwilfy@COMCAST.NET
> Subject: Re: Headlight upgrades
> To: vanagon@GERRY.VANAGON.COM
> 
> I just bought a set of HID conversion bulbs that I am going to try in some
> DOT spec housings.  If I don't like the way it turns out I will probably
> just convert some broken DOT housings to Cibie H4 by modifying the
> reflector into a mount for the H4 light.  You break out the glass and cut
> down the reflector until you can expoxy the new housing to it.  Done this
> before and it looks very stock.  I would then try some led bulbs from
> Amazon that are H4.  Amazon has some highly rated 9004 conversion kits if
> someone wants to try a set in your DOT housings.
> 
> Just some ideas.
> 
> Ken
> 
> On Sat, Jan 16, 2016 at 2:20 AM, Jeffrey Vickers <jeffrey@vickersdesign.com>
> wrote:
> 
> > Looks like the headlight connectors on these lights only work on Euro spec
> > vans for now. I assume their U.S. lights will come with U.S. connectors.
> > Another issue will be lenses. Are these LEDs designed to work with e-code
> > (euro) lenses and not the DOT lenses on U.S. vans? E-code lenses throw an
> > entirely different beam than DOT lenses.
> >
> >
> > > On Jan 15, 2016, at 7:30 PM, Automatic digest processor <
> > LISTSERV@GERRY.VANAGON.COM> wrote:
> > >
> > > -----Original Message-----
> > > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> > Of
> > > Alistair Bel
> > > Sent: Friday, January 15, 2016 1:23 AM
> > > To: vanagon@GERRY.VANAGON.COM
> > > Subject: Re: Headlight upgrades
> > >
> > > Sounds like a drop in led bulb for stock lamps. Will be interesting to
> > see
> > > how well that works. Pics on site showing beam pattern not conclusive.
> > >
> > > I wonder if the led drop in has heat sink and fins sticking out at the
> > back.
> > > I didn't see any pics of the actual bulb on the site. Did I over look it?
> > >
> > > Plenty of choices for drop in led bulbs already out there. What makes
> > camper
> > > van culture version different would be interesting to know.
> > >
> > > Hers an example from bangood. Philips copy? Has fan on rear fins. Not
> > sure
> > > if van has space behind lamp for this model
> > >
> > >
> > http://www.banggood.com/1Pair-90W-9000LM-6000K-H4-H7-H11-Philips-LED-Headlig
> > > ht-Bulbs-Conversion-Kit-p-995456.html
> > >
> > > Alistair
> >
> 
> 
> 
> --
> Thanks,
> Ken Wilford
> John 3:16
> www.vanagain.com