Led project

Hi, trying to help a friend with a small lighting project, she wants a few leds in a display she has got to make for a course, they need to be very bright and need to be on for a long time without creating a lot of heat. They must also not be to directional. Any ideas out there, thanks.

 

That's what my friend is trying to achieve, they have to look like fire flies and will be wrapped in gauze so cannot get hot hence the leds, but must try to give an all round glow. Not sure that makes sense but that is what is needed.

 

Ah, that looks a bit more like it, thanks. Better to wire in series or not?

 

OK, got some straw hats and they do the job. Now got a new request to rig a flickering led to mains. Found a lot of fake candle leds but they are all battery and I need to wire them to mains as they will not be easily accessed to change a battery, Is this possible or do I need to go a different way? Again thanks for any help.

 

OK, so I've got the straw hats and I need to wire them in singles and threes. I've attached the specs for the adapter and the leds, how do I work out the resistor for the singles as it looks like the threes will be ok?

 

Thanks Harald, I've got some reading to do now.

 

Update, the reason I'm trying to do this is a friend has asked me to help with a Fairy display at a local tourist attraction. There are five display cases that have single and multiple lights in them. Only a few have to flicker to look like candles and they are only in one case, the rest are to represent fireflies caught in lanterns. It's spread out so I thought using xmas lights would be impractical as they would need a major rewire anyway. We've had it running well once but the leds didn't look very good in daylight so we have decided to try brighter ones. Hope this makes things a bit clearer.

 

Hi me again, just wondering if I can use these with an AC power supply (12V) with the right resistors http://www.ebay.co.uk/itm/261427123170?_trksid=p2055119.m1438.l2648&ssPageName=STRK:MEBIDX:IT

Also looked at these http://www.besthongkong.com/loose-l...ng/red-blue-dual-flashing-led-water-clear-5mm


Thanks for any help

 

OK, got some blue and green flashing LEDs and using the resistor thingy I used a 470 ohm resistor and they worked really well hooked up to a 12V ac transformer. connected them to a different 12V transformer and they light up but don't flash. What am I missing? First transformer is an old scalextric, input 240V-50 Hz, output 12V-11VA. The new transformer is input 230-240 Vac 50Hz 150 VA, output, 12Vac 150VA. The bulb is forward Voltage 3.0 V max current 30mA. I did try them on the old transformer and they flashed.

 

Wiring in parallel, just figured out that the adapter that works is DC, bum, now I have to source some cheap AC to DC adapters. How would I work out the amps needed for say five LEDs in parallel

 

I've got them in series at the moment but it would be very easy to put them in parallel, the specs for the LEDs are a couple of posts back but try this, http://www.ebay.co.uk/itm/50-QTY-UL...al_Components_Supplies_ET&hash=item5ad5c35e22 they did not come with a built in resister although I know some do.