On 08/11/2020 00:58, williamwright wrote:
On 07/11/2020 18:47, Jeff Layman wrote:

I replaced a 70W sodium with a 30W LED and it seems to be much brighter.

Strange, unless the 70W sodium was on the way out. When new, the latter
gives around 5000lm, compared to less than 3000 for a 30W led.


It wasn't on it's way out. But yes, it is strange. It could be
perception; yellow light versus white light.

I guess so. But (if I remember correctly) it makes me wonder why - maybe
30 years ago - there were recommendations for using yellow-coloured
glasses when driving at night to improve vision, particularly when it
was foggy.

--

Jeff