LED lamps, source and value

I like the apt way you call them complaint bulbs.

Paypal dispute resolution is a joke. You get a 1 off of 80 characters including spaces to describe situations that can't be shoehorned into that no matter hw mch u abrv wds.

NT

no

of course

no

The problem is not technical, it's penny pinching.

NT

Thanks, but the power supply is okay. I have three toroidal transformers presently used with the halogen lamps and they do not cause interference problems. The problem would be converting to DC and I wonder if this could be done without using these switched mode devices (that I still need to read up about).

Thanks. I don't follow it all but I am getting the idea. I will Google linear regulators later.

Would it solve the problem if I used a different type of device rather that switched mode?

I am beginning to think I should stick with halogen and make equivalent energy savings elsewhere, in the same way that organisations offset carbon by planting trees instead of by cutting energy use.

Thanks. I'll start with Google.

Device? I don't know what you mean. Maybe unsnip some.

Halogen is just a crap option for indoors. Some people love them of course, but then some people drive Trabants.

NT

FWIW, I've put about 10 Poundstretcher 3W LED bayonet bulbs around the house (branded Muller Light, or something like that, £1 each) in often-on locations over the past year. No problems so far.

If you followed the rest of the thread, you would have seen the link Bob helpfully posted:

Very insightful. It's for the kitchen not the toilet though.

What lighting would you actually recommend for a kitchen and for what reasons?

In the interests of science, could you hold a DAB radio close to one of these bulbs and let us know whether it causes RF interference.

Poundland sell both 3W and 5W LED bulbs - for a pound, obviously - with a variety of bases including BC.

I've used the 3W version in bedside lights and they are fine

As with RJH could you do me a favour and place a DAB radio nearby to see if there is any interference?

It possibly wouldn't be of too much use to you. Pound shop products such as this tend to change on a monthly basis. What you buy today will be supplied by another manufacturer next month and that is likely to have different electronics.

If you look at some of the LED bulb tear downs on Youtube you will find that the electronics in pound shop LED products range from very good to absolute crap. Often the worst compromises or bad designs are in the smaller bulbs such as the small down-light halogen replacements - there is not a lot of room inside the casing.

I did

You can always power LEDs with a linear supply, if suitably designed, but i t's not as efficient.

se, but then some people drive Trabants.

Linear fluorescent used to be a fairly good option if done properly, not so me ugly bare switchstart fitting on the ceiling. Now LED strips are better as they're more controllable, lower cost, less of a pain to get & stock. Bo th are diffuse light sources, giving clearer vision, especially useful in a kitchen.

NT

I am trying to find out whether it is possible to construct a bulb that does not cause RF interference. Your explanation admits this possibility.

I'm not sure you are following the thread. If you were, you would know the question is whether it would cause RF interference.

I'm not convinced LEDs are as easy to look at directly as a fluorescent tube.

LEDs themselves don't cause any interference. It is the power supply that does if this happens. And a SMPS is far more likely to generate RF than a linear type.