[TCUG] Re: LED Heads
- From: "Welsh, Paul" <Paul.Welsh@xxxxxxxxxxxxxxxxxx>
- To: "'tcug@xxxxxxxxxxxxx'" <tcug@xxxxxxxxxxxxx>
- Date: Thu, 16 Oct 2003 11:50:35 +0100
All the installations I have seen have been very crisp. When mixed, it
makes you realise that there is a fade out on tungsten, but I have never
seen an inappropriate reaction from drivers.
When all three are on together, it is obvious something is wrong, because
the intensity is halved, due to it being an electrical pathway through more
than one lamp. I have never known an accident because of it, callers
usually said "it looks odd" or similar. It used to happen once every few
years, though has become less common, result of testing?
How that guy got off is beyond belief, someone must have been asleep.
With tungsten lamps, using a camera with a motor drive, it is fairly easy to
pick out a shot with all three lamps on, press the shutter 1.5 secs into the
red with amber and review what you get - dead easy, but not a real situation
in terms of how people behave.
PW
-----Original Message-----
From: David B Thompson [mailto:DBT@xxxxxxxxxxxxxxxxxxxx]
Sent: 16 October 2003 09:43
To: tcug@xxxxxxxxxxxxx
Subject: [TCUG] Re: LED Heads
Most LED's that I have seen installed have the opposite problem, where the
change is very "crisp". This can sometimes look odd where there is a mixture
of normal lamps and LED's, for example where the LED's have been used for
high level signals.
I do seem to remember that at least one of the newer LED heads, from either
Siemens or PEEK has been made to look more like a tungsten lamp, by using
the "on board" microprocessor chip to give more of a ramp to the switch on
and switch off of the lamp.
The only other time I have seen all lamps on together on tungsten lamp
sites, is where there was a loose common neutral in the head/polecap. I
would not have thought LED's would be affected in the same way.
Dave
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