The company I work with has a sensor touring rack with D20 modules, several are in need of repair, probably power cube replacement. With the growing use of LED fixtures, it would be useful to have several R20 relay modules instead of a full rack of all D20s. Is it possible to convert a D20 to an R20?
No, I'm afraid not, the insides of the two modules are extremely different so not really any way to convert.
Depending on your fixtures, it may be ok to run them through dimmers set to switched mode to act as relays, see this support article: https://support.etcconnect.com/ETC/Fixtures/Desire/D40/LED_Fixtures_and_Moving_Lights_Powered_by_ETC_Dimmers
Thank you! I read the article and work from that knowledge base.