I think it's H4.
Toyota Camry 1999 model - replacement of interior console light
I'm trying to find the answer for that on a 1997 Toyota Camry.
Try this link: http://wiki.answers.com/Q/How_do_you_replace_the_headlight_bulb_located_on_a_1994_Toyota_Camry
Opened the 1998 Toyota Camry hood compartment. Take hold of the light bulb connector. Push the connector in and turn at the same time. The light bulb will come out. Reverse the process to install the new light bulb.
Camry 1999 has only on bulb for both low and high beams.
You should be able to go to any local auto parts store to get that information.
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take the complete headlight assembly loose or out to get to the bulb.
Good Question, I have to replace my headlight as well. My Wife noticed it was blown this morning. What you have to do is to open the hood of your Toyota and dependant upon which side of the car the bulb is being replaced look behind the headlight. There is a collar that you have to twist about a quarter turn to remove. Do this after you remove the wire connection from the back of the bulb. Please ensure that your car is turned off and the keys are in your pocket. Remove the bulb from the socket, put the new bulb in the socket. It is just a plug in pull out connection. With the bulb and connection made replace the assembly back in the location behind the head light assembly. Give the connection a slight twist to lock it in place. Close the hood and test the bulb replacement.