Remote switch for battery powered LED
Hi. Firstly, I'm a software man, never done an electronics project but I own a multimeter and can use a soldering iron. So here's the problem: for my son's wedding in May (that's him in the pic), he's rented an ancient barn with a beautiful timber roof going up to 5 metres. They want to decorate it with coloured paper lanterns, hanging on invisible fishing line. I suggested lighting each lantern with cheap battery operated 10 LED strings. Problem is how to turn them on/off from ground level, say 4 metres away. So I'm thinking infrared triggered switches. There's going to be about 30 lanterns so the receivers must be cheap on components. Here's a possible example of the LED's http://mobile.festive-lights.com/battery-lights/10-warm-white-led-indoor-battery-fairy-lights-clear-cable.html
Voltage can be 3 or 4.5v DC depending if 2 or 3 battery model is chosen. I don't know the current of the LED strings,
I'm thinking I'll need to insert the receiver switch inbetween the battery pack and the LED load. Hopefully the receiver won't drain the batteries too much in "standby" as we might need to rig the lanterns 4-5 days before the wedding and it's not practical to get up to the lights again. So, long explanation... I've seen a couple of projects on this site which look nearly right but my knowledge isn't enough to make adjustments. Can anyone give me a solution from which I can build a prototype? I'm hoping I can use an old TV remote as the transmitter.
Thanks in advance for your help