1. Rationale
Affirmative with Comment Vote by Charles Barlow: 1. I will agree that this scheme might work without compromising the energy of the charging light. 2. It is vital that NO language be added that would prohibit the testing lab from using a direct lighting scheme in their testing lab. Affirmative with comment Vote by Marina Batzke: I do like showing this illumination intensity reduction tool in the Appendix of the test method, yet I am not certain if baffle is the best word. Would open grid or attenuator describe the photo better? Consider finding a better term than Baffle, maybe as part of an EDITORIAL CHANGE. Affirmative with Comment Vote by Karl Smith: In general, this [baffle] revision is an improvement over the existing standard. However, it has come to my attention, from a colleague with extensive photo-optics engineering expertise that baffles with large, regularly spaced orifices may in fact generate diffraction effects which could lead to regions of higher and lower intensity at the test sample surface (but would not affect the wavelength of the light). A more effective, neutral method of attenuating the light without other effect on it, would be to use a metal screen, or series of screens, with many, many small orifices, where the diffraction effects would on average cancel out, resulting in a neutral density , wavelength independent, non-polarizing, very uniform attenuation of the light from the light source. Considering the above, but in light of the benefit of advancing the other features of the proposed revision, I am submitting a vote of abstain, in order to allow this proposed revision of the standard to advance. However, I would propose that further review of the definition of the attenuating system be addressed by a task group. I would also recommend replacement of the terms black baffling system and black screen mesh system, with the term wavelength independent, non-polarizing light attenuator.
Keywords
illuminance; luminance; photoluminescence; ICS Number Code 13.100 (Occupational safety. Industrial hygiene)
Citing ASTM Standards
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