Going to switch to full yellow fogs soon.
I figure I'll share my research for anyone looking into oem mk4 headlamp and hella micro de fog lights.
Some of this information is VERY specific to these lamps.
Please mind that when choosing lighting options for your fogs, this is not a guide for how to rig up your f-150 but an explanation of my choice in lighting on my mk4 jetta.
I picked 85w Hella Yellow Stars
for the headlamp fog
I've done research on the wattage increase between the 55 oem and 85 yellow star.
****I would never suggest using anything more than 85w for a lamp intended on 55w and I'm not going to suggest using even 85w until I run them for months and can state my own claim.
If you choose on doing this, you're on your own buddy! I'm not accountable for it.
There is a significant heat, light and load increase.
My fogs are wired with a relay and a fuse so my wiring will be completely safe for the load. I am using an ECS relay, I highly suggest similar if you run any sort of fogs.
These suckers will push out a lot more heat than the oem, however it shouldn't be so much as to distort the fog housing since it is in fact metal.
I found threads of people who have been running them for years with no problems on the mk3 fogs. The mk4 fogs are better built.
They are metal and the reflector is magnesium(about identical to the hella micro de). The lens is spaced further away and quite thick. There shouldn't be any issue here.
This one isn't thought about so much. Increasing your light output can actually create problems.
You're putting much more light through a housing that was built for a certain amount of light.
So a very small amount of glare from a housing with a 50 watt bulb could be completely intolerable at 100 watts.
This however isn't a reflector housing and they cut off below my main bulb very cleanly.
I feel these three tolerances are within mk4 headlight fogs capabilities. 85w is quite an increase but it's not overboard. You could say I'll be pushing it a tiny bit.
These are not tuner yellow, however they look quite yellow when viewed head on. There is only a light coating on part of the bulb.
I'm choosing 3000k color and higher to keep away from getting pulled over for having stupid tuner yellow lights.
**** Yes, you WILL get pulled over every week if you're running tuner yellow 2,500k lights. 3000k is OEM lexus yellow, so I feel safety in this.
These are picture of Hella yellow stars in the oem MK3 fog lights.
This last picture is with the e-code halogen low beams and fog lights on.
I will be upgrading to a 35w 3000k HID kit in the hella micro DE's.
These I would suggest putting in you hella micro DE's. There isn't much room to mess up.
I found diy and full information on spacing this bulb to work perfectly in the lamp to the halogen H3 bulb. I want to make sure the efficiency of the lamp isn't compromised by bulb dimensions and light angle.
It requires a small spacer between the bulb and where the bulb sits.
I need to make a small bracket to hold the bulb in, found DIY for that as well on vortex, it's very simple.
piece of tin, drill and tin snips, too easy!
VWVortex.com - DIY bulb retainer for H3 HID's
This is a picture of hella micro de's with 3000k HID kit.
And this is the 50$ hid kit. Many run this kit with this lamp DDM Tuning 35W and 55W HID Kits
Notice sharp cut off, this lamp is very compatible with HIDs.
The fogs are 100% controllable and can be put on or off during any beam. So during night driving I will switch to main bulb which is white.
It would be unlikely for me to have all the lights on at once. There isn't much point of shooting 10,000 lumens onto the road unless I'm on a back road in the country with no street lamps.