OT: LED versus sodium street lamps

[Huge]

Do you wear glasses? If so, it's probably the point source of light being refracted by the bevel edge of the lens.

[ARW]

Maybe - but you ought to see the pages of specialist designed lighting specs that are in my job folders when I have fitted car park lighting.

[tony sayer]

Down our street they have one thats placed in the branches of the tree and one has been removed so theres some light at either end but a large are of dark in the middle;(..

Conforms to regulations I'm told..

Bollocks it is anyway:(...

[Chris French]

That's certainly a possibility, i'll ahve to try it one day with out my glasses on....

[Dave Liquorice]

Maybe I was being a tad simplistic. You still need a spec to say what the light level should be, what variation is allowed, what spill is allowed, etc etc. Then the "specialist designer" selects the appropiate luminare, refelctor/lens etc to meet that spec from the specs given in the brochure/catalogs. They don't do the maths to find the optimum emmited light, beam angles, overlap of coveregae etc etc. They try and find something to match those requirements.

[Peter Johnson]

That is not so.

[charles]

Skanska have the contract for Surrey.

[Steve B]

sorry to interrupt the general discussion.

I've not had experience of LED streetlight, living out in the sticks and all, but am not a particular fan of domestic LED lighting as I find them overbright.

However, what I do find difficult is the use of LED's for vehicle lighting, especially when the traffic is oncoming. I've recently gotten a pair of night-driving glasses, which do cut down on the glare tolerably well.

[Adam Aglionby]

Just like sound then , flick through the hire cat, grab some `vocal` and `i nstrument` mics , good to go... ;-)

Its really not that simple, its a world of beam plots and reflectance co-ef ficients, your lighting a space which interacts with the light source and d aylight and users , things like car parks have to carefully consider glare.

Balance with the clients wish to spend fork oil on install and less on runn ing, Pick a source technology , find appropriate luminaire, liase to get al tered if required to fit spec, rinse , repeat, take contract hit out on arc hitect.... Like the generation game looks simple when experts do it right a nd as shown by the thread its easy to do wrong.

Free to use software

BTW LPS lamps are only now made at Philips in Hamilton, last place in Weste rn World making the lamps.