Moss balls are fine with just room lighting. They can live in a jar.
LED lights work well. Some are bright, some not.
I have the Aquatop 36 LED clip on on one tank... very bright.
It's $31 on Amazon and works well for live plants.
There is also the Dymax Robot, a smaller Aquatop, a few other aquarium brands and as stated... lamps.
You can also get some really cool led stuff on Ebay. Like this light...
I have a couple, I use one in my 10 gallon hospital tank. They work well, and be put under the water.