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- since 1996 -

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DJ Kallhof
DJ Kallhof
04:01 Apr-14-2004
White light emission

Has anyone recently experienced difficulty with white light eminating from their black lights . A well known NDT equipment manufacturer has replaced the bezel of their standard light with the bezel of their fan cooled model. The slots allowing for air flow emit 3fc of white light at 15". As the sensor moves closer the white light emission rises. When asked about the situation the manufacturers rep insisted I was the only one to experience this problem since they made the change a year ago. Any input would be greatly appreciated.


 
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Bruce
Bruce
01:28 May-19-2004
Re: White light emission
Dear DJ,
Due to being away on leave I am somewhat late in responding to your post which deserved an urgent response. The "whitelight" being emitted is probably unfiltered raw UV and therefore highly dangerous.
The level of 3fc(30lux) at 15" is particularly high, and apart from a danger to the eyesight, would have a detrimental effect upon unprotected hands if hand held examination is involved.
My advice is DO NOT USE THIS LAMP until this emmision is completely eliminated by an effective barrier.
White light emission THROUGH a proper UV filter is another matter entirely. Most Standards specify an allowable total white light emission up to 2fc(20lux) on the part being inspected, which includes ambient light infiltration into a light restricting hood.
Whitelight emission from most blacklight spot hand lamps does not exceed 1fc(10lux) when measured with a whitelight meter respondind to the standard CIE photopic curve. Regards Bruce


 
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