The RACUP range of Arcadia Controllers are designed to fit T8 (26mm diameter) lamps. The controller has been specifically designed reptiles in mind but can also be used with aquariums or any application which requires a fitting for a standard T8 (25mm) fluorescent tube. The leads on this controller can be detached from the main unit – the benefit of this is that it allows them to be fed through mesh or grills and then reattached. Comes complete with plastic clips to secure your tube. (ACUP15 for 15-18 Tubes. ACUP18 for 24 Tubes. ACUP30 for 30-36 Tubes. ACUP36 for 42-48 Tubes).