The Gummy Bear Lamp is one of Spencer's art works that is made out of multi-colored gummy bears. It appeared in iGot a Hot Room episode (which is Carly's birthday).
It is the gift Spencer gave to his lovely sister, Carly (who's been wanting to have a lamp in her room for a long time). Spencer told Gibby to put the lamp and turn on the light in Carly's room, due to overheat, the lamp bulb exploded and burned the entire room (which causes Carly to fall into a deep depression for what happened).
After a couple days, Spencer rebuilt Carly's room (using the $82,000 he got from the diamond-encrusted wrist watch that burnt in the fire) and replaced the gummy bear lamp into a gummy bear chandelier.
Gummy Bear Chandelier
The Gummy Bear Chandelier is another piece of artwork made by Spencer that is made out of multicolored gummy bears too; to replace the burnt lamp (that caused the fire accident in Carly's room) he made for Carly. It appeared first in iGot a Hot Room episode and it reappeared again in several episodes in Season 4 of iCarly.
You can buy a chandelier just like this one along with other items similar to those in Carly's room at http://jellio.com/store.html.