GBE Eye Safety Analysis

Is Growing Beyond Earth Eye Safe?

You may be wondering if the Growing Beyond Earth (GBE) light source is eye safe. This is an independent analysis for GBE eye safety using the standards NASA employs for the International Space Station (ISS). The author (wxazygy) has no contractual relationship to MARSfarm Corporation (the manufacturer).

Full report is here =

Summary Conclusion (The Bottom Line)

ACGIH eye-safe radiance for long-term viewing of White LEDs with Solar solid angle correspond to PAR measurements below 120 µmol m-2 s-1.

PAR meter measurements of the Sun on a clear day run about 2000 µmol m-2 s-1 and are reduced by 85% to about 300 µmol m-2 s-1 when viewed through a GBE wall.

Light levels inside the GBE chamber will exceed EXEMPT eye safe limits when each color is operated separately above the following light settings:

Red R > 48

Green G > 64

Blue B > 128

White W > 96

With GBE walls in place (85% reduction), viewing GBE lights through the walls is eye safe (EXEMPT) when each color is operated separately at any power level.

When multiple colors are used at the same time, the optical power can be estimated by summing up the contributions for each color.

An increase in one color will reduce the output of the other colors (WxAzygy, 2022 - see n-PAR Zero Sum Game). Therefore, the summation of independent contributions will be a worst case.

Comments & push back welcome!

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GBE_Eye_Safety.pdf on ResearchGate