Possible to replace HID bulbs with halogen?

Won't be easy; you'll also have to rip out the electronics that power the bulbs and install new bulb sockets and wiring.

 

i'm sure someone with halogen headlights would swap the entire headlight housings with you, allowing you to do this, but really its rather pointless, new HID bulbs do cost 4x as much as halogens, but should also last much longer, be brighter, etc.


(short answer- no)

 

Windstrings, Bruceha 2000 and I think others seem satisfied with the inexpensive HID replacement bulbs bought from eBay:

http://priuschat.com/forums/care-ma...7938-my-hid-bulb-replacement-my-06-prius.html

I think Windstrings bought his 2 for $69 bulbs from this eBay seller:

Search results for Lighting, Lamps & Accessories 4300K HID Xenon D4R in Car & Truck Parts & Accessories

And here's a link to Bruceha 2000's excellent HID installation photos with step by step instructions:

PriusChat Forums - bruceha_2000's Album: 2004 Prius HID bulb Replacement

If I were in your shoes, I'd try the eBay bulbs first. $69 is a lot cheaper than the $600 - $700 charged by Toyota dealers for the bulbs alone.

 

Make sure you get the right replacement size (check your owner's manual).

-- Windstrings got D4R for his 2006 Prius.

-- Bruceha 2000 got D2R for his 2004 Prius.

 

Searching for and looking at some of the older HID posts, I'm not sure that Bruceha 2000 got his replacement D2R HID bulbs from eBay for his 2004 Prius.

But here's a link to D2R HID bulbs from the same eBay seller that Windstrings got his D4R bulbs:

eBay Motors: NEW 4300K HID 35W Xenon OEM Replacement Bulbs D2R (item 260300158622 end time Jan-11-09 16:51:31 PST)

You might want to PM Bruceha 2000 for advice or to ask him where he got his replacement D2R HID bulbs for his 2004 Prius.