I currently have the Cambridge Great Internet Migratory Box of Electronic Junk, from which I salvaged a 12V white CCFL that I think was the light in a scanner, so decided to make this lightbox self-illuminating to remove the need to point lights at the outside or mess around with slave flashes. The whole thing is self-contained and only needs a 12V power source to light itself.
Step 1: Materials Needed
- A large cardboard box- mine held a duvet and measures roughly 18" x 15" x 12"
- A cardboard box long enough to hold your CCFL. I used a shoebox
- Enough white paper to cover four sides of your large box
- Permanent marker
- Something for a diffuser material, eg. paper or a white plastic bag.
- A white CCFL and inverter
The large box will be our lighting stage, open at the front. The shoebox will house the CCFL above a window in the top of the "stage" box, with a diffuser separating the two to provide soft light into the stage.
Step 2: Prepare the Lighting Box
You could leave it as this, however I was worried about not having enough light output so lined the shoebox with slightly curved kitchen foil to help reflect the light into the lightbox. Remember that CCFLs work on high voltage so be sure to keep the foil well away from the light's wires.
The inverter only had short power wires so I soldered an extra 2 metres of wire to it, and terminated it with a connector that could plug into my computer's power supply.
Step 3: Make the Window
Cover the window with your chosen diffuser material- I used a rectangle cut out of a dry cleaning bag that blocks less light than using paper would. I stuck the diffuser to the inside of the stage box so it wouldn't interfere with attaching the lighting box on top, and I could change the diffuser later if I needed to without removing the lighting box.
At this point, due to a critical failure to plan (plan to fail, indeed) I attached the shoebox before I papered the inside of the large box. It would make more sense to attach paper to the inside of the stage box before you attach the lighting box
Step 4: Wallpaper and Finish Construction
Now you can attach the shoebox, open side down, over the window in the "top" of the large box. I used plenty of hot glue, especially at the corners, so that I could pick up the entire construction by lifting the shoebox.
Step 5: Fire It Up!
If you are going to take photos in your lightbox, make sure you do a manual white balance first. I first switches this on in daylight and closed the blinds, and it was evident the light had a slight green tinge to it that will probably mess up photos on daylight or fluorescent white balance settings. There's plenty of white to do a spot white balance with!
When taking photos in a lightbox, use a tripod so you can use the lowest ISO and a slow shutter speed for maximum light input. Most of these photos were taken on ISO 200, f3.2, 1/40 shutter by hand.