RuneScape Classic Wiki
RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Orb of light
The Old School RuneScape Wiki also has an article on Orb of light.

An Orb of light is a quest item obtained during the Underground Pass quest. Each orb must be used on a furnace. Players who use the orbs on the well instead of the furnace will take damage. They are found through a series of passages leading outwards from a room containing an altar and a well.

White orb

The white orb is obtained from the northern passage. Two planks must be picked up in order to cross the passage and return safely.

Blue orb

The blue orb is obtained from the western passage. Various traps must be disarmed in order to take it, and if one cannot be disarmed successfully, all of the previous traps will be triggered and the player will take damage. Having more than 20 Hitpoints is advised throughout this passage.

Pink orb

The pink orb is obtained from the northwest passage past various rats and ogres.

Yellow orb

The yellow orb is obtained from the southwest passage. A rope must be used with a stalagmite in order to cross the spikes safely.