LED replacements for general use lighting & noise

[RicharD]

I know that Doug's thang is mainly bicycle lighting but I have questions concerning the up-n-coming LED replacements for incandescent lighting.  I am in the middle of helping Yellow Dog Studios upgrade their electrical system.  I've already replaced their sickly old FPE panels, cleaned and balanced loads, and made preparations for the addition of studio3.  The owner, being into the latest and greatest stuff, asked me about LED lighting.  At first thought, I assumed it should be quieter, thinking along the lines that DC filaments are quieter than AC filaments, but then it dawned upon me that they probably use the cheapest switching power supplies made.  The question is:  Do LED replacement lights put trash on the AC line?  I think putting in a unique DC lighting system is not feasible whereas I don't want them to have replacement issues down the line.  I'm hoping Doug has done some research.  I've kinda looked around the web and have come up empty on the topic.

BTW:  Yellow Dog is getting their 2nd API console for studio3.  Studio1 has a MCI 24 track interfaced with a Clasp system into ProTools.  Boy thangs have changed since my day as a studio rat.   

[EL34]

I have't messed with any of the LED lamp replacement stuff yet.

I have looked at them and wanted to try a couple, but never did it.

Check out the 100's of choices available with free shipping
Maybe some of the reviews for the bulbs would be helpful

http://www.dealextreme.com/products.dx/category.907

[RicharD]

My current plan is to get one of my electrical supply vendors to give me some samples.  I guess this is my very own research project.  I'm kinda surprised because there's been ages of talks about how noisy fluorescent lighting is.  Of course now that we're seriously into the "information age", there's a lot of "you don't need to know that" floating around.  Hopefully next week I'll have something to report.

[VK_Electronic]

the old adage "you get what you pay for" comes to mind

buy cheap switching PSU and you get noise and hum

buy good stuff and you don't

if paranoid, isolate acoustically and electronically

LEDs themselves would very good choice - no hum, long life, different color temperatures available, stable, lower temp

[Refugee]

I made my own replacement lamps.
They run on 240VAC directly without an electronic ballast.
They are free of noise that makes AM radio reception difficult and have been in use for a year now without any failures unlike what they replaced. The heat sinks are hidden in the original fittings.
The shop fitters here in the UK have discovered them and the prices of the parts have more than doubled

[EL34]

Which LED is that?

[Refugee]

I have just had a look at the web site I got the LEDs from and they have discontinued that part and replaced it with a 4 die type.

http://uk.farnell.com/seoul-semiconductor/an4222/acriche-4w-sq-mod-230v-w-wht-no/dp/1768733
You will be able to get the data sheet from here.

They come in both 230 and 110 volt ratings and would be best obtained from there US site.
It is called Newark and would reduce shipping cost for the US.
Use the manufacturers part number if the UK one does not cross reference.

[EL34]

The die in your pictures looks like a P7 LED
The new die looks like a XML LED

They look to be 50 lumens
Not sure how bright that is after messing with the 1000 lumen LED's I use in bike lighting

Of course 1000 lumens is way beyond what you would use for indoor lighting

I found them at mouser
http://www.mouser.com/ProductDetail/Seoul-Semiconductor/AN4240-03-S-FA/?qs=sGAEpiMZZMu4Prknbu83y3dK%252bGU6Eopu5tpV%2FMwsSDI%3D

Looks like the forward voltage is 55volts, so two in series plus a current limiter should do the trick for 110 volts

[Refugee]

The one in my photo if you look carefully you can see that there are four dies visible through the lens.

[EL34]

I don't see that in your pictures but I saw that in your link

Which picture are you talking about?

[Refugee]

I have had a bit of a fiddle with my $160/£99 camera and coaxed it into showing the structure of the die on one that has been stored for a while. What I thought was four dies is actually the wiring interconnecting them and also quite a bit of dust that had collected on it.

[EL34]

Oh yeah, there are four small dies inside the larger package
That's how many of the SSC high powered LED's are made that I have seen

I thought you were talking about four LED's on one board like I saw at Mouser

This image of a SSC P7 shows the four LED's
You can see the little gold wires that link them to the solder points

[Refugee]

The four LEDs in yours do not have a filter in front of them.
My photo shows the links sticking up out of the warm white filter material that covers the dies. They are at an angle to the square shape of the assembly because they link from the corners of the individual LED dies so that they are all connected in series. The 110V part would have two series pairs of dies.

[EL34]

The four LEDs in yours do not have a filter in front of them

That is a SSC P7
It does not need a filter
It goes into a housing with a reflector to make a spot beam
Or it is used with optics that can shape the beam into a spot

[Refugee]

What I built was the opposite as I had to spread the beam out to light a larger area.
They were fitted behind a bit of diffuser as used in office ceiling strip lights.