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January 26, 2014 / consort3

MR16 Led bulb problem

A friend recently tried to retrofit LED MR16 bulbs for the Halogens originally fitted in his relatively new  shower down-lighters. However he just got a flash or nothing when the new bulbs were tried. This is a very common problem and is caused by the electronic transformer type supplies used to convert the 230Vac mains to 12V for the bulbs.

I could not find much on the net about this but eventually found this article which explains the problem in engineering terms:

Basically the LED bulbs demand so little current that the supply does not turn on. One way around this as described in the article is to wire 4 led bulbs in parallel to create enough load for the supply to turn on. The more correct way would be to use a Led driver supply.

More on the Halogen electronic transformers from Rod Elliot:

I have started to modify existing lights to use GU10 230V ac bulbs and found this firm helpful:

The most be one of the oldest firms still going, being founded in 1840

Flourescent tubes are now being replaced by Led types. Cree have had to recall some

Good article on light bulb specifications

A friend had this early version of the British fused plug made by Dorman Smith (1955)


Image courtesy Flameport

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