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August 19, 2018 2 min read

What is Super-LumiNova BGW9? Swiss Super-LumiNova® BGW9 is a phosphorescent pigment, otherwise known as Lume, emits a Blue-Green glow in the dark (as the name suggest) when properly charged by either sunlight or artificial light. In a daylight condition, BGW9 is white in colour.

Among the range of Super-LumiNova® colours, BGW9 ranked second in terms of relative brightness, with C3 coming in first. The relative brightness of BGW9 as compared to C3 is estimated to be 5% dimmer.

Given their similar brightness, the applications between C3 and BGW9 are generally limited to their aesthetic. With C3 being light green in daylight and glows green in the dark. While C1 has a similar colour profile as BGW9 in daylight condition, it is glows green in the dark like C3. With C1, its relative brightness is one of the lowest among Super-LumiNova® colours.

Here is a chart showing brightest lume on the left to the weakest lume on the right. 

Relative Brightness Yield of Super-LumiNova® Colours Chart
Image 1. Chart on the relative brightness yield of Super-Luminova® Colours. Credit goes RC TRITEC


  Day Night Relative Brightness
C3 Light Green Green 100%
BGW9 White Blue-Green 95%
C1 White Green 31%


Check Out Our SEIKO Mod Parts With Swiss Super-LumiNova® BGW9!

Unbeknownst to most, phosphorescent pigments come in Swiss and Non-Swiss versions. With Swiss luminous having a much higher cost and higher quality control. As compared to the Swiss origin, the Non-Swiss counterparts are lower in cost and bearing about half the luminous duration, an estimation of 4 hours on a full charge. Interestingly, prior to acquiring rights on the application of Swiss Super-Luminova® BGW9, stringent requirements of the manufacturer to achieve Swiss standard quality controls and ISO certifications have to be met regardless of purchasing power.

Here are examples of Seiko's Lumibrite & Swiss Super-LumiNova® BGW9 being on our dials . I have also added in Omega Speedmaster '57 - uses Super-LumiNova®.

Image 2. Photo taken with Canon EOS M; No filter or image enhancement. 

Image 3. Photo taken with Canon EOS M; No filter or image enhancement.

Note: All six watches are taken with a single shot, same intensity, exposure and duration to artificial light.






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