I'd like to fit 230V Tridonic LED light engines, pictured below, (as suggested some time ago by @Carrerahill  https://forum.buildhub.org.uk/topic/13775-led-llmf/#comment-227778) in some plaster-in downlighters.

 

 

The instructions for the downlighters show two different mounting options for the electrical connection.

 

1) Shove the connection block / transformer at least 20mm away from the lamp, which would work:

2) Mount the connection block on a stirrup (supplied), which doesn't work when using a light engine...

...if you've not already spotted the problem, the stirrup is fixed to the part of the downlight that's plastered into the ceiling. But a light engine needs wiring to the connection block; do that and you can't change it if it fails, unless you rip the fitting out of the ceiling.

 

So option 1 seems the logical thing to do.

 

However must be some regulations that require the use of the stirrup in some circumstances - otherwise, why supply them - but If there are, I can't find them, and the supplier can't tell me either. I only recall stirrups being used with GU10 (& maybe Gu5.3) lamps, so my guess is that it's a requirement for them. But as one of those could be retrofitted to replace my planned light engine, maybe that still needs to be taken into account. But then why show 2 mounting methods? Going round in circles...

 

If anyone is able to, err, illuminate me with what regs apply and when, that would be very helpful.

 

 

 

Edited March 30, 20251 yr by Mike

As long as the driver isn’t sat on top of the lamp then you’re fine. In instances where there’s been insufficient height behind the ceiling those stirrups have gone in the scrap bin.

Ditch them and carry on, just ensure the drivers are pushed aside.  👍