The halogen bulbs for our recessed ceiling spotlights have to be replaced quite often.

Could we be using the wrong transformer/bulb combinations? How would I find out? Does the number of bulbs attached to any one transformer influence the life-span of the bulbs or the transformer? Are these bulbs drop-in replaceable by LED bulbs?

Transformer output: 11.5V, 35-105W

Bulb specs: 12V, 30W

The situation: Due to their location in the room we have 2 bulbs connected to a transformer. We have a total of 6 transformers and 12 bulbs.

Please leave a comment if more specs are needed to answer this question, then I will try to look them up. NB: The grid voltage is extremely stable in our neighbourhood.

1 Answer 1


These bulbs can fail from overheating. If there is insulation in the space around them you may need to remove some to give them some ventiation, and it may even help to cut a small hole in the attic flooring.

  • Insulation can also be a fire hazard - make very sure you don't have any near the fittings. May 10, 2016 at 20:41

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.