Unplug all power cables that control your aquarium lighting unit from the mains and let the unit cool down completely (Ideal to change the bulbs at the time of day which your halides are not in use, saving you having to disturb the timing of your aquarium lighting.)

Remove your lighting unit away from above your aquarium and place somewhere which will not hinder the process of replacing your bulbs.

Make sure you wipe the new bulb down with the lint free cloth provided. If you touch the glass your hands leave an oily residue. When the bulb heats up this residue can attract the heat from the bulb thus focusing the heat on this spot. Over a short time the temperature can built up and put lots of pressure and strain causing the glass to warm and even crack/smash. In turn this shortens the bulbs life span.

		Once the protective UV glass has been removed and you are able to access your old bulb please follow the following steps:
		Place one end of the lamp into the one end of the sprung lamp holder connections (universal for all branded halides).
		Then push the lamp in against the sprung connection, enough to allow you to make contact with the opposite side of the lamp and the opposing sprung connection.
		Make sure there is a secure connection between the lamp and the fitting.
		Make sure the ballasts have cooled down before you replace the bulb as the new bulb will not ignite until ballasts have cooled down fully.

To remove the 150w bulbs please repeat the process in reverse order.

WARNING:
Make sure the protective glass is securely in place before you plug your unit in and attempt to turn the halide light on.