Retrofitlab V50 Retroquick Projector Kit and Aharon Ballasts

For this review, I’ve ordered what Retrofitlab calls a “complete solution” for P1 HID retrofits, their Volvo V50 (2004-2012) bi-xenon E46-R (D2S) – Halogen headlights combo kit.

TL;DR: Yes, this kit is suitable for P1 retrofits, if installed correctly (especially ground!). Bulb failure warning functionality is not retained, as is the case with all relay harnesses. 

The reason I wanted to investigate this kit in particular is it claims to be a complete solution, their description includes a fun tidbit about the wiper motor (as was pointed out on the SwedeSpeed boards) and it’s in the Netherlands which is where many of the international SKBOWE orders came from.

Email from customer service at retrofit lab
No info on canbus, but at least he acknowledged the SKBOWE…

The product description did not specify how their “Canbus harness” worked, and an answer from their sales team did not do much to clarify, so I figured I’d order a set and see what showed up.

What’s Included

This kit *is* complete, as everything you need for a relay harness install w/projector swap –  For a cool €284,95 (that’s about $325 USD) + shipping, this kit includes:

  • 2x 3-inch D2S “E46” replica projectors (see identification chart) and bulbs
  • 9005/HB3 high beam splitters with solenoid connectors (so you don’t have to make your own like How To: 9005 to 2-wire Bi-Xenon Solenoids)
  • AMP to D2S adapters with grommets and integrated H7-to-9005  adapter.
  • Aharon Speed Start 35W ballasts
  • Relay harness
  • Load resistors

As noted below, the parts I received were average quality, while the kit is priced at ultra-premium levels – you are paying about €75 ($100 USD) for the convenience of not having to source the components individually (e.g. Amazon, eBay, etc.) and presumably, having real support.

Product Description

I believe, especially for those new to HID retrofits, that the product description copy is misleading in several ways so I have annotated it for the uninitiated:

This Volvo V50 retrofit kit contains everything you need to convert your halogen setup into powerful bi-xenon projector headlights.* Custom-made to fit your existing headlights and including all the correct wiring and a selection of OEM-style shrouds, it makes retrofitting quick and easy. And, most importantly, it will take your V50 to the next level – just check out the test pictures! This is way beyond what the majority of OEM projectors can achieve.

The Bosch AL E46 [1] is an incredibly bright bi-xenon projector, enabling you to use D2S OEM bulbs, including the most powerful options from Osram and Philips[2]. You will literally outshine the competition. With available colour temperatures ranging from 4,300K to 6,000K, the crystal-clear 3.0-inch lens throws a low beam with a bright hotspot and sharp cutoff. As for the high beam? It’s like the sun.

Such a light output would not be possible without efficient ballasts, and the included Aharon digital ballast has – as opposed to many other aftermarket units – been tested to generate a full 35W. The Aharon comes in a rugged and extremely compact housing perfect for retrofitting, and its in-wire starter warms xenon bulbs in as little as five seconds. It is also Canbus-proof, so you won’t get any bulb failure readings on your display[3]. This ballast is the perfect complement to the included Volvo V50 wire harness, which connects directly to the original wiring. A high beam splitter is also included, making for easy integration of the bi-xenon mechanism. Power supply is strong, steady and reliable.

* Please note that Volvo V50 is one of a select few vehicles that may also require our custom Canbus harness in order for your dash, lights and wipersto work as normal[4].


[1] The projectors are replicas, not "Bosch" or  "AL"  and the E46 does not exist. They are the correct size and bolt pattern for the P1 vehicles
[2] Misleading, as the kit comes with generic ("$20") bulbs; though it *will* work with Osram and Phillips bulbs if you buy them separately
[3] Misleading, as (per their own footnote) you *will* get bulb failures if you don't get the optional harness.
[4] Note that the dash will not work "as normal" even with the "Canbus harness" (which is really a relay harness + resistors), because if a bulb burns out there will be no indication. I think they meant, there will be no BOW when everything is working. Interesting that they included wipers here.

While misleading, there is nothing patently false in the description, so I will chalk it up to marketing “artistic license”…

What Showed Up

Arrived Dec 26, so it’s literally like Christmas!

Package arrived from the Netherlands in good shape after 20 days (about standard, for priority mail international). I was most interested in the “Canbus harness”, so I tore into that first.

The “canbus harness” is just a relay harness with integrated load resistors

As I suspected, their “Canbus harness” is just a relay harness, with load resistors. There is no capacitor so it won’t work with the US/NA DRL, but I don’t think thats a thing in the EU so no fault there. I was relieved to see the relay harness has all necessary elements for a P1 install, rather than a DDM-BOW3 style eliminator.

Resistor pack marked as “C30” reads 5.4 ohms

The resistors are marked “C30”, which considering the options which were not marked, I assume means a nominal 30W draw. I read 5.4-5.5 ohms, which is inline with the 25W threshold and my 5 ohm recommendation . Someone did their homework 🙂

Actual current draw through only the load resistor was 40W at 14V

The load resistors are a unique design, and it sounded like there was something loose inside of them so I cracked one open and it is filled with what appears to be salt?

Internals of load resistor
The load resistor is packed with what looks like salt

Not sure if that’s for heat, or moisture, but it is surely a unique design. I do worry about vibration slowly grinding the crystals down into powder, leaving that ceramic element banging around inside the aluminum case, but that is probably many thousands of hours away. Nice quality on the high-temp wire insulation, though I was not impressed with the case itself, strain relief, or grommet. I would have preferred to see thermal epoxy over salt.

Note the ferrite inline with the HV leads. Nice!

Anyway, moving on to the ballasts. I had not heard of Aharon before, but they feel nice, comparable to Morimoto XB series. Some interesting features:

  • There is an integrated “Canbus” module inline with the supply lead
  • There is a ferrite inline with the hard-wired ignitor (not replaceable)
  • There is a ground tab on the mounting bracket, although the case is not connected to ground and there is no provision for making contact through the case. Perhaps this is an attempt at RF shielding?

The reason I compare it to Morimoto, despite it not having replaceable ignitors, is that it looks very similar to the XB AMP ignitor (down to the cable braid):

Aharon vs the Morimoto XB ignitors. Same factory? Or at least same tooling?

Although advertised as a 35W ballast, it draws nearly 60W of power, so it is likely running bulbs hot.

Inline “canbus” on Aharon ballast, un-potted.

It does run off the signal PWM directly, as it has an integrated “canbus” error eliminator which was poorly potted using silicone inline with the power feed. The back cover of this unit was not glued, and the silicone potting pulled of easily. This design will not protect against condensation and corrosion in an automotive environment for long.

This module has two 16V  10,000UF 105c capacitors the and a single silicon diode, as well as a choke, MOV, and a few resistors for an RC filter. I did not reverse engineer the circuit yet, but based on the size of the choke this is tuned for a much higher (1KHz +) PWM frequency.

I do NOT recommend using the Aharon ballasts without the relay harness in P1 vehicles even if it seems works – 20,000uF at 16V is not enough capacitance for 80Hz PWM. Subsequently, the single diode is subject to large current spikes gets very hot (PWM only, it’s fine on the relay harness):

142F (60c) without the heat of the engine, etc. This will get worse as the capacitors degrade.


  • This relay harness + load resistor kit is a safe way to retrofit a P1 with HIDs, and the included projectors are drop-in including bi-xenon  functionality.
  • All components included – this is a true “plug-and-play” kit (aside from having to drill a hole in the housing cover, of course)
  • Now that SKBOWE is out of production, this is a great alternative especially if you are in the EU
  • Average component quality, some aspects similar to Morimoto, though projectors are replicas.

Overall: 4/5 stars: -1/2 for cheap silicone potting, -1/2 for no screw holes in ballast case.