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Class I, II, & III

Discussion in 'Strobe Lighting' started by Snowzilla, Jan 26, 2011.

  1. Snowzilla

    Snowzilla Senior Member
    from Iowa
    Messages: 397

    Anyone know what defines the different class ratings of warning lights. I know I is brighter than II or III, but is there some authority who sets the rules on these? Maybe there are situations where a Class II or III is preferred over a class I.
     
  2. John911

    John911 Member
    Messages: 31

    Sae

    Society of Automotive Engineers (SAE) makes these recommendations, which are in turn used by States to describe required intensity levels for warning lights.

    At a minimum for amber, Class 2 is 2.5X brighter than Class 3. Class 1 is 4X brighter than Class 2. Measurements are in candela/second/minute.

    Generally, 3 is only off-highway (think forklift warning light).

    2 is typically work trucks, working by roadside (think cable truck).

    1 is typically primary warning (think police/fire).

    Many States are shifting from 2 to 1 for work trucks as the added intensity id better noticed in bright sunshine and allows for greater reaction distance.
     
  3. massfirefighter

    massfirefighter Senior Member
    from mass.
    Messages: 128

    Class 1 = emergency response (requests the right of way)
    Class 2 = Warning/hazard
    Class 3 - identification
     
  4. Snowzilla

    Snowzilla Senior Member
    from Iowa
    Messages: 397

    That's exactly what I was looking for! I found very little on the internet about this. So by what you guy's mentioned. Class II may be most appropriate for snow plowing? Class I may be overkill? and Class III a little weak. I have a Class III led beacon and its kinda weak in day light.
     
  5. massfirefighter

    massfirefighter Senior Member
    from mass.
    Messages: 128

    Class 3 is usually el-cheapo. Class 1 and 2 are the way to go if you want or need to be seen. Class 1 is necessary to clear traffic for emergency response.