AvaLight-DH-S-BAL Balanced Power Light Source

The AvaLight-DH-S is a powerful deuterium halogen source, but, like any unbalanced deuterium halogen source, it does have a very dominant alpha peak at 656 nm. This is why Avantes developed the DH-S-BAL, in which this peak is drastically reduced by a dichroic filter. This means less power, but an increase in the dynamic range of a factor 20. A comparison spectrum as taken with a standard AvaSpec-2048 is shown on the next page.

The light source delivers a continuous spectrum with high efficiency. The highest stability is in the ultraviolet, visible and near-infrared range, from 200 to 2500 nm. An integrated TTL-shutter and filter holder for filters of up to 50 x 50 x 5.0 mm are included. The TTL-shutter can be controlled from any AvaSpec spectrometer, which means the auto-save-dark option in AvaSoft software can be used (please note: IC-DB26-2 cable is needed). 

Connection to the fiber is done through an SMA-905 connector, which features an adjustable focusing lens assembly. This ensures you have the maximum possible power into your fiber. For all deuterium light sources, solarization resistant fibers (-SR) are recommended (see the fiber-optic section of this catalog). The output of the AvaLight-DH-S-BAL is optimized for fibers or bundles up to 1500 µm.

  • Balanced light source
  • Wide spectrum: 200-2500 nm
  • Integrated TTL shutter
  • High efficiency
  • Increased dynamic range

The filter holder can be easily replaced by a direct-attach cuvette holder CUV-DA-DHS (see section accessories) useful for fluorescence or absorbance measurements.

Spectral output AvaLight-DH-S-BAL (orange) vs. AvaLight-DH-S (blue)


  Balanced Deuterium (Standard)
Balanced Halogen Lamp
Wavelenght Range 215 - 500 nm 500 - 2500 nm
Warm-up Time 30 min. 20 min.
Lamp Power 78W / 0.75A 5W / 0.5A
Lamp Lifetime 2000 hrs 1000 hrs.
Noise (AU) 2x 10-5 10-4
Max. drift ± 0.5%/hr ± 0.1%/hr
Color Temperature - 3000 K
Optical Power in 200µm fiber 6 µW 17 µW
Optical Power in 600µm fiber 33 µW 160 µW
Optical Power in 1000µm fiber 90 µW 448 µW
Power consumption

90 Watt (190 Watt for heating D-Lamp 4-5 sec.)

Power Requirements

100-240VAC 50/60 Hz

Dimensions / Weight

315 x 165 x 140 mm / ca 5 kg.

AvaLight-D-S-BAL Balanced Deuterium Light source, 215-500 nm, incl. TTL shutter, -SR fibers needed
AvaLight-DH-S-BAL Balanced Deuterium-Halogen Light source, 215-2500 nm, incl. TTL shutter, -SR fibers needed
IC-DB26-2 Interface cable AvaSpec-USB2 platform to AvaLight-D(H)S-BAL
AvaLight-D-B Replacement deuterium bulb for AvaLight-D/AvaLight DH-BAL light source, 2000 hrs
AvaLight-DH-B Replacement halogen bulb for AvaLight-DH-BAL light source
CUV-DA-DHS Direct-attach cuvette holder for AvaLight-D(H)S-BAL