I found the following at:
http://www.freewebs.com/csic/lightbulb.htm
How many CSIs does it take to change a light bulb?
During the summer reruns of 2006, the members of Elyse's board tried to find out. The responses:
None - CSIs are not afraid of the dark.
None - the CSIs use MagLites.
None - they just use the Alternate Light Source.
None - the scene must be left intact.
None - Sara prefers darkness and gloom.
None - if a light goes out, they just ask Billy to smile.
None - they'd rather keep Ecklie in the dark.
None - Ecklie can just stand by a window and let the moonlight reflect off his head.
None - Warrick can generate his own light and heat.
None - if Grissom wears his blue & white Hawaiian shirt, there's no need to change the bulb... the shirt lights up the room.
None - Hodges changes the light bulbs; he "nose" when they are ready to burn out just by the smell.
None - the light bulb wasn't burned out; Horatio just forgot to take off his sunglasses when he walked inside.
None - the detectives (Brass & Sophia) change them, but they are never quite sure which one of them did it.
None - if the light bulb goes out, they just build a new set.
None - someone in the crew will change it before the next take, because who cares about continuity of plot, anyway?
None - they never change the light bulbs at CSI headquarters; they prefer to keep the writers in the dark.
One - Cath will screw anything.
One - Catherine's a take-charge kind of woman; but she'll need her cell phone to tell Lindsay she can't go to the movies tonight, there's a light bulb that's dying and Lindsay needs to be more understanding.
One - Grissom, but he makes Sara climb the ladder.
One - Grissom; he needs light to start reading "Moby Dick."
One - Just Grissom, because he has the true power to relinquish power, even electrical power.
One - Grissom; he has to identify the dead bugs in the socket.
One - Grissom; but first he quotes Shakespeare: "Out, out, brief candle..."
One - Grissom, because he subscribes to the Light Bulb Changers of America newsletter.
One - Grissom, but it'll take awhile because he's a lapsed Catholic and must stand in the dark wondering "What did I do wrong?" before changing it.
One - Horatio just holds the bulb in the socket and waits while the whole world revolves around him.
One - Greg volunteers because it's hard to read girlie magazines with a flashlight in one hand.
One - Sophia will change it, but she'll talk to herself the entire time.
One - as long as it isn't Nick; he's been afraid of light bulbs since "Grave Danger."
One - Archie, the AV man.
One - Mac, but he'll have to remove his shirt first.
One - David; he has to establish the time of expiration.
One - Warrick, because he's always prepared and carries extra bulbs in the trunk.
One - Sara, but it takes her 12 steps to do it.
One - Sara; she'll pick up a fresh bulb when she goes to the store to buy more cough drops.
One - Brass; he was demoted to custodian after his failed hostage negotiation this season.
Just one - but if he/she changes anything, the case may be thrown out.
Two - one mysterious hand to replace the light bulb, and a camera man to slowly pan around to reveal the CSI's face.
Two - one to change the bulb, and Horatio to grieve for the dead bulb.
Two - Grissom and Sara; one to start the process and the other to pull away at the last minute.
Two - Warrick and Catherine, because they always wanted to screw together.
Two - Warrick to fix the problem and Tina to give him permission to stay late at work and change the light bulb.
Two - Hodges to wonder if changing the lightbulb will finally impress Grissom and the Pyschologist that comes in on Tuesdays and Thursdays.
Three - one in Las Vegas, one in New York, and one in Miami.
Three - Grissom to ask Nick to replace it, Nick to do the job, and Sara to corner Grissom in a limo to ask why she was passed over for the task.
Three - Nick, Warrick & Catherine; Nick to do the work, Warrick to stand there without appearing in the scene and Cath to boss them both around.
Three - Nick and Warrick to take odds on who gets burned first, and Grissom to tell them it isn't their job to change light bulbs, get back to work.
Three - someone to change it, Greg to argue that it's from his private stash of Hawaiian light bulbs, and Grissom to tell him that it's a community light bulb since he stored it in the community storage closet.
Four - one person to change the light bulb, then Jorja to describe the light bulb as a "tiny ray of sunshine"; Billy to insist that the light bulb never burned out and has really been on for years but no one's noticed; and Marg to "watch the light unfold and try to keep it a secret."
Five - one to change the bulb, one to take photos, one to dust for prints, one to bag the evidence, and one to take the dead bulb back to Doc Robbins.
Six - Grissom to initiate the change, Catherine to take him to task about it, Sara to complain about it, Warrick to smooth it over, Greg to get the work done and Nick to tell him, "Good Job Greggo." It takes a team to raise a #1 Television Show.
All of them - they're a true team.
Twenty - two CSIs to get locked in the supply closet & 18 fans to document and interpret it in fanfiction.
One million - one CSI to change the bulb and 999,999 fans to analyze the implications of the new light bulb to the current cast dynamic.
No one really knows - Some people see it one way, others see it in a completely different way. It's a matter of interpretation. Some think the light bulbs on CSI should never change, while others are eager for change. Some think that the light bulb isn't the problem, but rather that it's the power source that is damaged. They used to have electricians on the CSI set, but they were all transferred to CSI Miami because that setting requires much brighter light. William Petersen has been unhappy about that, but Les Moonves assured him that CSI would still have enough wattage. Some people wish they would forget light bulbs and use candles because they want to see some romance on CSI. And some people think it doesn't matter at all; it's just a TV show.