Panasonic PT-RS20K Operating Instructions Manual page 10

Hazard distance (IEC 62471-5)
The distance at which the level of exposure has dropped to the level of the applicable Exposure Limit Value is
known as the hazard distance or safety distance.
Do not look or stare into the light beam from a distance closer than the hazard distance (RG3 = risk group 3).
Beyond this distance the light beam is considered to be safe. (RG2 = risk group 2)
RG3 level is considered to be a hazard to the eyes from direct radiation.
RG2 level does not pose any optical hazard and can be safely used in all situations.
Hazard Distance
D1
RG2
D2
RG2
Lens
ET-D75LE50
ET-D75LE6
ET-D75LE10
ET-D75LE20
ET-D75LE30
ET-D75LE40
ET-D75LE8
Lens
ET-D75LE90
ET-D75LE95
*1 Hazard Distance
*2 D1, D2, D3, D4, A1 and A2 changes in accordance with projection lens shift amount.
Each number in this table is worst case.
Note: Each table complies with IEC 60825-1 (2014) and IEC 62471-5 (2015)
10 - ENGLISH
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HD
RG3
Except ET-D75LE90, ET-D75LE95
Hazard Distance
HD
RG3
ET-D75LE90, ET-D75LE95
HD* D1* max.
1 2
0.52
< 1.0
0.70
1.2 0.68
1.7 0.73
3.2 0.94
4.8 0.74
7.8 0.76
HD* A1* max.
1 2
< 1.0 2.16
Hazard Distance
HD
D3
RG2 RG3
D4
Hazard Distance
HD
RG2 RG3
D2* max. D3* max.
2 2
0.52 0.75
0.70 0.73
0.68 0.72
0.73 0.78
0.94 1.01
0.74 0.79
0.76 0.81
A2* min. D3* max.
2 2
0.26 1.70
(Unit: m)
D4* max.
2
0.75
0.73
0.72
0.78
1.01
0.79
0.81
D4* max.
2
1.70