Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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.

share|improve this question
up vote 2 down vote accepted

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.

share|improve this answer
Insulation can also be a fire hazard - make very sure you don't have any near the fittings. – Someone Somewhere May 10 at 20:41

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

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