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| Question.1 |
What is the luminance standard for Photoluminescent Material ?
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| Answer.1 |
JIS Z 9107 (Japanese Industrial Standard) and DIN67510 (German Industrial Standard) define the luminance.
The following table shows the luminance above-mentioned two Standards define.
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Luminance(mcd/m2)
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Time
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5min
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10min
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20min
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60min
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JIS Z 9107
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110
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50
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24
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7
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DIN 67510-1
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60
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30
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-
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5
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DIN67510, concerning the photoluminescent pigment and its applied products,
defines the limit of luminance we can recognize by the naked eye is 0.3mcd/m2.
The following table shows luminance standard. (from our experiment data)
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Luminanc
(mcd/m2)
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Visibility in darkness
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Visible
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Invisible
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Over5
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Very bright and clearly visible
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10/10persons
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0/10persons
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Under3
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Outline is visible
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10/10persons
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0/10persons
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Under2
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Dimply visible
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10/10persons
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0/10persons
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Under1
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Nearly invisible
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3/10persons
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7/10persons
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| Question.2 |
What is the shape of Photoluminescent Material ?
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| Answer.2 |
When initially calcined, it is clumpy. Later it is pulverized into various grains of powder. |
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| Question.3 |
What color do photoluminescent pigments emit in the dark?
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| Answer.3 |
We are now commercializing four colours; blue green, sky blue and orange.
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