I replaced my Samsung DLP light after noticing the tv would turn off on its own and noticed it just was not as bright as it once was..... this unit is complete , not just a bulb , its the whole box that just slides in where your old one slides out.... super easy and now my dlp tv is super bright.

** UPDATE **

The lamp ended up having a problem of blinking on me.... I ordered one from Samsung direct and fixed the whole problem... so unfortunately the lamp only worked for a couple of months so I cannot recommend this lamp. Get it from samsung directly - its about the same price and just as easy to install.