The Lamp Room

Anyone know when Philips stopped using different coloured caps on their Sox lamps. I vaguely remember seeing a leaflet someone posted explaining all caps will be red just can’t remember when or where.

I haven’t seen any blue cap PSG lamps for sale for ages that’s all. Used to always be on eBay etc. I have a green cap 26w Sox e PSG as well although it’s the only one I’ve seen in person.

Well ive got 2014 PSG lamps with blue caps, and 2015 PSG lamps with red caps. So sometime around them two years. I dont know exactly what months though

4c and 4l are blue