Ian Stirling wrote:
Ian Stirling wrote:
Chris Bacon wrote:
What about sub-zero [performance of bulbs], I wonder?
I've stuck one in the freezer.
Will post in an hour.

First bulb - 1/2 hour in freezer.
Starts instantly, quite dim for first 10 seconds, then it rapidly warms
up towards normal brightness.
I would estimate that a 20W bulb is equivalent to the initial output of
a 11W bulb at room temperature 15 seconds in.

That's very useful, thanks for the results!