Originally posted by evobenny
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If the luminous markings on a watch are reasonably sized and arranged, the readability in the dark is primarily determined by their total light emitted. In order to assess the relative merits, the light intensity of two dials with identical markings by mb-microtec trigalight (BALL H3-watch ) on one and SuperLumiNova on the other, were measured and compared.
The results, with the light intensity expressed in the unit “nanocandela” (ncd) are given below.
after (in darkness) 0 min. 5 min. 1 hour 8 hours
BALL
(in nanocandela) 6000 6000 6000 6000
LumiNova®
(in nanocandela) 10000 6000 400 30
The radio luminescent trigalight of the BALL watch remains constant, while the purely phosphorescent light of the SuperLumiNova may initially be brighter but diminishes within minutes and becomes progressively less luminous.
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