RAKSHA BEAM ASSIST (RBA) is a combination of a Sensor and a Solid State Relay that are together capable of changing vehicle headlamp beam without the intervention of the driver based on the set of objective road conditions. Its primary aim is to reduce the dazzle for the observer approaching ahead of the vehicle while ensuring that the user will not be put to inconvenience. The sensor will be installed inside the car cabin while the relay sits under the car bonnet. The relay handles the electrical switching of the headlamp between different beams.

Automatic Meeting (DIP) Beam

It has to bring into operation the meeting beam from both headlights whenever an oncoming vehicle approaches to within about say 250 meters with its headlights in driving beam until the vehicle is about to pass. The RBA, after bringing into operation the dip beam, should logically be capable of continuing the operation of the headlights in dip beam, if the headlights of the oncoming vehicle were also shifted to the dip beam.

Automatic Driving (HIGH) Beam

It has to bring into operation the driving beam if there is no oncoming vehicle. Necessarily this means the RBA must be immune to the signals from; street lamps, moonlight, road reflectance, solar radiation during the late dusk and early dawn.

The Ability Of Restoring Main Beam In The Event Of Glare

The ability is to restore the driving beam, when the oncoming vehicle approaches with its head lights in driving beam position during the safe stopping sight distance. This ability will result in increasing the luminance towards the objects in the visual field and will result in an improved visibility against a high background luminance. The above said ability will have its relevance and utility (even if one assumes that all the vehicles are equipped with an RBA) due to the following reasons:

  • A wrongly aligned meeting beam can sometimes cause as much dazzle as is caused by a driving beam.
  • The road geometry in a particular situation can be such that even a properly aligned meeting beam can cause disability glare.
  • The meeting beam's light distribution pattern can get totally disturbed if proper bulbs are not used.
  • The most important factor is that this ability will bring into operation an RBA fitted to an opposing vehicle at a longitudinal distance which is higher than the safe stopping sight distance, which ensures that both vehicles will pass in meeting beam during the safe stopping sight distance.