HID, High Intensity Discharge is a gas discharge at high temperatures and pressure that leads to high light output. As Xenon is used as main filling gas, this light has also been named xenon light in automotive applications. The discharge process is initiated by a very high voltage pulse and transferred into a continous arcing. The starting process and the control of the arc are handled by a ballast.

Nucon Xenon bulb ballasts

Ballast Versions Dimension

Full digital ballast developed by Nucon: A micro controler is calculating out of a number of parameters like the lamp voltage, input voltage, PCB temperature, etc. the duty cycles and frequency for the power MOSFETs. The digital device can be connected for remote and diagnosis purposes via a serial bus interface to a personal computer. The ballast is based on planar transformers, they use the PCB itself for the windings granting the same quality by low cost. This ballast has a superior DIMMING RANGE 18-70W !!!

Automatic test and calibration, diagnosis and remote control of output power. Tracing by interface of ballasts in the production and field. Configuration of wattage fast or soft start for specific bulb type like DUV35 by software.

If you want to design a portable HID search light with the best components available we can help you with the required parts!

Automotive discharge lamps


Philips D2S PDF

The ClickOn starter converts D2S into D1S version. The version we use is the same manufacturer like Philips Gen3.

BR-003 diameter matches with D1S or Click On starter. D1S plugs and cables can be made to the desired lengths.




DL50 50W longlife bulb version 50 EUR/p: paypal is possible email for price and delivery conditions

Don't be blinded! The DL50 offers only nearly double the light output compared to a D2S 35W, with a very long lifetime and can be powered also at 70W !

Chinese D1S on the right side. This bulb we ordered at a German Dealer and gives us reason to beleave that faked Osram and Philips bulbs are now distributed on the market! Only when looking at very specific details you find lower quality hints of the plastic mold. There is a crap burner on the Chinese brand mounted, but we are sure that the mold will be used to fake Philips D1S. It is a sad but true story in China they fake evrything: ICs, MOSFETs, capacitors,...


Philps D1S spec

The discharge bulb has two electrode wires inside a small elliptical shaped burner volume. An ignition coil generates a flashover between the electrodes to start discharge. The first automotive discharge bulb was the D1. The improved D2S has its burner inside a glas tube for protection. It also has a high voltage connector socket. The U1 bulb was specially edited for an US company with an insulated outer elektrode to reduce the danger of electric shock. The further improved D1S now uses a socket integrated ignition coil for the high voltage pulse generation. Each discharge bulb requires still a ballst, even with the ignition coil being integrated in the socket. Our nucon ballast is directly connected to the D1S bulb. In order to run a D2S bulb an ignitor modul can be put between the ballast and the D2S using a high voltage connector. Preferably a click On starter in D1S style is to be used.

D2S H4 bulb version with direct connected compact igniter unit. The connection cable between igniter and ballast can be made depending to the customer needs quite long that an easy mounting of the ballast inside the vehicle can be achieved where sufficient space is available. Note: in most countries simple upgrading from halogen to HID is not allowed!

32 W type

HID drop style arcbow

21W and 32W HID bulbs ideal for installation in existing small reflectors. The 21W bulb is minimum dimmable down to approx 15W. This bulb has very intresting properties in combination with Nucon ballast like fast flicker free light run up and hot restart capabillity. No outer conductive free touchable electrode important for safety reasons. An ideal bulb for 2 wheel applications like motor cycles or bikes and other portable systems. A smaller Nucon ballast including all safety features will soon be available!!
AC DC comparison

21 W type

Left: DUV35 UV Philips MPXL non automotive special bulb for UV-light material analyses or other industrial applications like glue hardening etc. For operation of the DUV35 our ballast can be ordered in a new special adopted SUPERSOFTSTART ballast version.

Right: RP50/35 MPXL Philips non automotive special bulb for coupling light into fiber optics with elliptical reflektor. This bulb is no longer available.

BS 21W HID reflector style, advantage safety: no naked conductive outer electrode!

2000 lm Xenon with D1S / D2S

Left: Brightstar UV bulb. Next bulb is a 24W HID H3 socketed, basically designed for DC bulb current however works fantastic with the new Nucon AC bulb principle which gives more light and more lifetime. Right thereafter you can see two views of the 24W glas reflector type (12° spot) Have a look at a comparisson in between 21W bulb and 24W bulb see also 24W HID bulb halogen comparisson. new hid spotlight comparisson between d1s 35W and 24W brightsstar.

Comparrison between Halogen und HID

H 1


D1 S/D2S



light generated by


incandescent filament


gas discharge


geometrical definition


boundaries clearly defined


diffuse boundaries


average luminance


2000 cd/cm2


6000 cd/cm2


power consumption:


68 W max.

Light source

35 W const.

25W const.


plus nucon ballast

40,3 W const.

29 W


luminous flux


1550 lm


3200 lm

2000 lm


lumen efficiency


25 lm/W


91 lm/W

80 lm/W


colour temperature


3200 K


4100 K

4500 K

Xenon retrofit without glare: Ballasts are preset to 25W. Bulbs are Philips D2S 4100K in combination with Click-ON from Sumida. The light distribution is very brought and stray light not there. The question is why not retrofit with 25W HID with already certified quality parts? The Philips D2S 35W is law conform and grants the tolerances and xenon projection lenses are available. The brightness is limited by the ballast to halogen strength. There is no colour blue shift nor flickr and you save even fuel energy with the existing cars!!!

The luminance distribution shows the higher temperature of the arc.

HID spectral power distribution shows little infra red light and is a continuous spectra. (picture taken from Philps catalog 96)

NEW spectral data page here

Why the luminous flux decreases ?
Find out why our ballasts have negative outgoing lamp voltage!

HID lifetime depends strongly on switching cycles. Overpowering should be avoided by the ballast. (pictures taken from Philps catalog 96)

HID advantages:

  • point light source of very high intensity for very long ranges
  • spectrum similar to day light with better light quality in most cases than LED promisses.
  • light properties are independent of supply voltage changes
  • high light output efficiency regarding total power consumption
  • no temperature control and cooling of the bulb is required like it is with LED
  • dimmable light source without little change of colour temperature
  • long life time and low replacement costs !

Nucon ballast characteristics:

  • small ballast dimensions
  • very high efficiency under a wide range of operating conditions
  • active false input polarity protection
  • bidirectional digital remote power controling option.
  • use of the remote control line can save lamp relay,
  • power levels over remote line dimmable example of application: flashing landing light
  • short protection
  • open output protection
  • input over voltage switching off with automatic restart
  • input under voltage shut down, self locked (battery protection)
  • fast restart cycles capability
  • smooth sinusoidal lamp current curve improves the EMI behavior compared to conventional ballast systems
  • smart light run up control
  • the height of the bulb operating frequency minimizes danger of hazardous electric shock
    (HF current does not flow inside the human body)

Nucon ballast electrical specifications :


normal input voltage range

8 - 30 V

extended input voltage range

6 - 30 V

starting input voltage range

8.5 - 29 V

nominal output power

34.5 W +- 1 W or higher 50W , 70W

low output power

20 W +- 1 W

maximum run up power

75 W

maximum run up lamp current

2.6 A or for softstart lower

maximum inrush current (@13.5V)

7 A

maximum inrush current (@ low power @13.5V)

4 A

efficiency ballast (@13.5 V)

90 %

efficiency ballast + D1S (@13.5V)


efficiency ballast + D2S (@13.5V)


output frequency

variable kHz range