As many other people, I am currently in the process of building an LED table, and I'm slightly confused.

The only real question I'm having is: in the original circuit diagram, what type of photodiode is being used? All I could discern from the building of the table PDF was that you were using a T-1 3/4 LED type photodiode in photovoltaic mode. Then while I was reading through the forum trying to see if you went anywhere more specific, I saw that somebody said they were "near-infrared phototransistors." If somebody could help me out and point out what type of photo-sensing device to use, that'd be greatly appreciated.

Thank you for your time.

We have made several different interactive table designs. The "original" one-- the Interactive LED Dining Table is the one that we've released, and it uses clear-lens photodiodes. Substituting phototransistors into that circuit probably would not work as well, given the high gain that the circuit uses.

Do these photodiodes have to be in photovoltaic or photoconductive mode? The photodiodes I have been using (http://www.advancedphotonix.com/ap_products/pdfs/PDB-C139.pdf) are geared for photoconductive uses. Should I replace these?

Scratch that last question. I've decided to replace them with the original SFH 203's you mentioned in the comments of the actual circuit, now that I bothered to read them.