light bulb or lightbulb

[meltoadhall]

Which is the correct spelling light bulb or lightbulb.
When I've been looking on the web they are both used is only one correct or is it an anomaly.

[Quizmonster]

Both The Oxford English Dictionary and Chambers offer only 'light bulb' ...ie as two separate words, not as 'lightbulb'. You could certainly get rid of any ambiguity by using a hyphen, of course...light-bulb.

[Tatty Rollox]

..... you resort to religion as at http://tinyurl.com/p7hze, Q ? And that gets rid of ambiguity ? .........

[Quizmonster]

Nice one, TR!
Tony, I myself would have used the hyphenated version without even thinking about it, thus being just as "wrong" - so to speak - as you.
Americans are getting rid of hyphens almost completely, it seems, producing absurdities such as 'coworker' to mean a colleague...ie a co-worker. Any time I see their version, I invariably read it as 'cow-orker' which gives rise to all sorts of dark imaginings as to the meaning of the verb 'ork'. At the present rate of import of americanisms, 'lightbulb' will soon be perfectly OK, so hang on in there! Cheers