BukkitLightLevel
This plugin can be very helpful for lighting up an area to prevent mobs from spawning.
With this plugin, a user simply has to hold a torch (or other light-emitting material) and particles will appear on nearby blocks showing relative light levels. Red particles indicate a light level of 7 or below, and such blocks are spawnable for most mob types.
The radius can be configured in config.yaml:
# Setting these to 0 will disable the plugin
sneak-radius: 8
standing-radius: 6
The max sneak-radius is 16 and the max standing-radius is 8. This is meant to cap the server lag that could be created when there are many players online.
