Test voltage 10.5V
Nominal wattage 30W
Nominal luminous flux 400 lm
Diameter 36.0 mm
Overall length 67.0 mm
Light center length (LCL) 31.0 mm
Base (standard designation) BA20s
Burning position s135
Order reference 1238 LL
Low-voltage high-pressure signal lamps have a much higher luminous efficacy than high-voltage signal lamps. This is due to the higher gas pressure and the inert filler gas. The larger diameter of the tungsten wire of the low-voltage filament also helps increase efficiency. This means that low-voltage high-pressure lamps with significantly lower wattages can often be used, with a resultant reduction in the power consumption of the signaling equipment. The filament wire is more stable than in the HV lamp, which means that resistance to shocks and vibration is particularly high. The failure rate for standard 10 V low-voltage high-pressure lamps is less than 2 % within the first 4,400 hours of operation. (The premature failure rate is restricted to cases that are due to lamp faults and not to external influences.) These benefits can also be put to use in existing 230 V signaling installations as it is possible to convert mains voltage installations to 10 V technology. For this, the lamp and reflector have to be replaced and a transformer installed.
Product benefits
-Much higher luminous efficacy than high-voltage signal lamps
-Clearly improved lamp quality due to higher gas pressure and inert gas filling
-Leads to reduced power consumption of the signal installation
-High resistance against shock and vibration compared to high-voltage lamps
-Max. premature failure rate: 2 % up to 4,400 h (related to lamp failures only)
Safety advice
Use only in equipment/luminaires that are specially designed for the purpose.
Protect the lamps against moisture during operation and installation.
