Illuminance balance

Too much high contrast calls eye fatigue between the lighting illuminance at the surgical field and that of atmospheric indirect one. So, some re-verification of them have to be performed for our new laboratory, verifying the results from the failure of the set once as an experimental attempt. Probably, much more additional stronger lighting devices would be required if we insist on indirect lighting design following my son's proposal. Basically, lighting change of day & night illuminance is very inconvenient for our definitely precise surgical procedure.
Any improvement of working environment especially in lighting at working place is worse doing for our field, otherwise there would be difficulty in contributing with works of uniform high quality. Lighting with adequate contrast balance is important.