T25 vs T100

With both T25 and T100 Tritium illumination options available in our collection, we often get asked “what's the difference?” and “which is better?”.

The answers are relatively simple, there is a difference (keep reading) and neither is better – it’s completely subjective.

The T rating refers to the total watch radiation content which is measured in millicuries. All watches with a T25 rating contain up to 25mCi of radiation content and similarly, watches with a T100 rating contain above 25mCi and up to 100mCi.

Each model within our collection features our signature Tritium tubes and we only use those supplied by the market leading Swiss manufacturer mb-microtec; who are widely recognised as the best manufacturer of Tritium tubes with an extensive range of colour and size options.

Whilst there are differences between the total mCi content in the T25 and T100 models, the idea of “which is better” is simply a choice of personal preference and taste.

During the design process we decide whether to create a T25 or T100 model based on the aesthetic styling and functional design.


Find more information on the Tritium illumination technology by checking out our dedicated page.