On 04/10/2015 11:35, ARW wrote:
wrote in message
...
On Saturday, 3 October 2015 19:10:26 UTC+1, ARW wrote:
nt:
...
On Saturday, 3 October 2015 11:24:59 UTC+1, ARW wrote:
nt:
...
On Friday, 2 October 2015 18:36:58 UTC+1,
wrote:

High pressure mercury vapour lamps were a common replacement in
street
lighting gas lanterns.

but are now obsolete,

Funny that. I swapped one last week and had no problems in buying
one.

Name any application in which they have an advantage over HID or
sodium.
There are none.

I have plenty of things at home with obsolete technology in.

eg your brain.

so there are no advantageous apps for mercuries.


Pretty good on a like for like swap.

If you wander round when is now known as the "adventure island" theme
park in Southend at night, its got loads of discharge lighting - in any
run of lamps they quite often alternate high pressure sodium with
mercury... So you get the yellow / pinky cast from the sodium, and a
slight blue / purple tinge from the mercury. The effect is actually
quite pleasing (far more so than either technology on its own would be).


--
Cheers,

John.

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