A simple class which makes use of the LightAPI by EvilSpawn and spawns light sources when the player holds a torch

LightTask.java

package de.matzefratze123.torchlight;

import java.lang.ref.WeakReference;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.Plugin;
import org.bukkit.scheduler.BukkitRunnable;

import ru.BeYkeRYkt.LightAPI.LightAPI;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

public class LightTask extends BukkitRunnable {

  //Max = 15, Min = 1
	private static final int LIGHT_LEVEL = 15;
	
	private Map<WeakReference<Player>, Location> recentLightLocations;
	private List<Location> spawn;
	private List<Location> delete;
	private boolean running;
	
	public LightTask() {
		this.recentLightLocations = Maps.newHashMap();
		this.spawn = Lists.newArrayList();
		this.delete = Lists.newArrayList();
	}
	
	public void startTask(Plugin plugin) {
		if (running) {
			throw new IllegalStateException("Task already running!");
		}
		
		//Higher this if running into performance issues
		runTaskTimer(plugin, 3L, 3L);
		running = true;
	}
	
	public void run() {
		spawn.clear();
		delete.clear();
		
		for (Player player : Bukkit.getOnlinePlayers()) {
			ItemStack inHand = player.getItemInHand();
			WeakReference<Player> ref = null;
			Location recent = null;
			
			Iterator<Entry<WeakReference<Player>, Location>> iterator = recentLightLocations.entrySet().iterator();
			while (iterator.hasNext()) {
				Entry<WeakReference<Player>, Location> entry = iterator.next();
				WeakReference<Player> keyRef = entry.getKey();
				Player refPlayer = keyRef.get();
				
				if (refPlayer != player) {
					if (refPlayer == null) {
						iterator.remove();
					}
					
					continue;
				}
				
				recent = entry.getValue();
				ref = keyRef;
				break;
			}
			
			if (inHand.getType() != Material.TORCH) {
				if (recent != null) {
					delete.add(recent);
				}
				
				continue;
			}
			
			Location now = player.getLocation();
			
			if (recent != null) {
				if (locationBlockEquals(recent, now)) {
					continue;
				} else {
					delete.add(recent);
				}
			}
			
			spawn.add(now);
			recentLightLocations.put(ref == null ? new WeakReference<Player>(player) : ref, now);
		}
		
		//It is extremely important to delete first
		//otherwise light bugs may occur
		if (!delete.isEmpty()) {
			LightAPI.deleteLight(delete);
		}
		if (!spawn.isEmpty()) {
			LightAPI.createLight(spawn, LIGHT_LEVEL);
		}
	}
	
	private boolean locationBlockEquals(Location loc, Location other) {
		return loc.getBlockX() == other.getBlockX()
				&& loc.getBlockY() == other.getBlockY()
				&& loc.getBlockZ() == other.getBlockZ();
	}

}