Keep in mind that if you have built a van for dwelling, the beams need to be readjusted lower as the extra weight sends them into the trees
I just Googled 2004 ford van. These are Sealed beam bulbs in the 6054 size.
The BEST sealed beam replacements are GE Nighthawk.
The BEST h4 replacements, these are reflector housings in which one can change just the bulbs like in newer vehicles are Cibie.
Hella H4 in the 6054's are OK, but once the low beams are aimed correctly, the high beams are too high. Any 6054 sold on Ebay is absolute junk. Do not waste your money or time installing them
JW speaker makes excellent LED lights in this size, but they are like 1000$ for a pain
Trucklite are also very good, and about 600$ a pair
There are dozens and dozens of 6054 size h4 replacements sold on Ebay. They are all horrible. Horrible optics, horrible beam pattern, cheap plastic lenses. total junk. Avoid Avoid Avoid.
Get a Multimeter on the headlamp plugs, with headlamps on. Measure the voltage at the plugs and compare it to battery voltage with the engine running. I made a new headlight harness with relays reducing my voltage drop from 3 volts to 0.3 volts.
HUGE HUGE difference in light output.
Halogen bulbs do get dimmer over time.
I have GE nighthawk 6054s and when they get 14.4v they are better than 85% of the vehicles that pull up next to me.
Do not, NOT, try and put HID lights into halogen housings. Do NOT try and put LED lights into halogen housings. BOth are ineffective, illegal and blind oncoming drivers.
Headlights and signal lamps are safety devices. Humans are no good at determining how well they can see something, and in general any floodlight will make the human think they can see well, but there is a lot going on in a properly designed headlight to make them safe and effective.
Yes improvements can be made, No, they are not sold on Ebay.
Please read up on this site.
http://danielsternlighting.com/home.html
Daniel stern is the authority on improving vehicle lighting.
He responds to Emails fairly promptly with recommendations.
Candlepower forums transportation section is another great source on how and more importantly how NOT to, upgrade your lighting.
http://www.candlepowerforums.com/vb...s-Included&s=b5a7ad5179ba74dd69ce79497c527cca
http://www.candlepowerforums.com/vb...best-6-quot-x-8-quot-sealed-beam-replacements
http://www.candlepowerforums.com/vb...hts-for-Ford-Van-than-stock-H6054-sealed-beam
Just keep in mind that how well you can actually see, can be completely different than how well you think you can see. And you will hear dozens of storied by those that did such and such and think their lights are awesome, but they are not. The inexpensive Ebay 6054s and other sizes, are a complete joke, and criminal.
Lots of "upgrades" are serious downgrades, as well as being illegal and annoying to other drivers.
Proper Voltage, proper Aim and getting rid of Wagner or Sylvania sealed beams in favor of GE Nighthawks will Yield impressive improvements. Sylvania are pretty much junk. the Silverstars....Well Sylvania got called on their BS marketing and have been fined huge sums for it. Their "whiter' lights, have a blue glass on the bulb which reduces Lumens, making it so the filaments have to be overdriven just to meet the minimum Lumen output standards, yet they make these ridiculous claims about how much better they are. These overdriven filaments blowout very prematurely.
Better would be Cibies with some Osram or phillips bulbs
Best would be JWspeaker 8800's
Trucklite LEDs are good, and they are now rebranded by GE
http://www.amazon.com/GE-NIGHTHAWK-...F8&qid=1418879618&sr=8-2&keywords=GE+LED+6054
Cheapest will be a relayed harness feeding properly aimed GE nighthawk sealed beams 6054's 14+ volts.