On Thursday, 22 March 2018 13:52:48 UTC, tabby wrote:
On Thursday, 22 March 2018 10:14:17 UTC, Dave Plowman (News) wrote:
In article ,
tabbypurr wrote:

LPS/HPS street light fittings were designed to give wide spread, it
reduces the number of poles thus costs.

I gather HPS do now come in white too, I'm not really familiar with
those though.

There are more modern alternatives to HPS. Still a discharge type, but
more akin to film etc lighting.

I presume you mean HID.

Nothing hits the efficiency of LPS yet, but its pure yellow light is hardly ideal.


NT

I meant to say I wonder why they don't combine LPS with LEDs in 2 colour channels. Then one could have
LPS only, yellow of course
LPS & LED for most efficient white light, or yellow-white for better efficiency
LEDs only for short term controllability.


NT