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2700K would be roughly the same as the existing halogens, and 4000K (Cool White) would be too clinical
Tungsten halogen is more like 3000K. 4000K is only just "cool", "daylight" lamps are in the 6000K area. It depends what your bathroom is for, in the morning if you want waking up and to see how you're going to face the world, daylight is probably better. If you like a night time wallow before going to bed, choose warm white.
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be aware also, that lots of halogen transformers can't drive LEDs steadily, and there is a strong chance you will get flickering/failing lights or need to switch the transformers. In the end we were advised it was less hassle moving forward to simply switch to a more common GU10 fitting - which with the number of lights we were replacing was more cost effective, especially once more expensive LED MR16 bulbs were factored in.
Currently have 6 x 12v 50W Dichroic 50mm M258 38deg Flood Beam halogens in the bathroom (no dimming).
Just put the last spare halogen in and want to buy LEDs for future replacements.
Looking here:
https://www.any-lamp.co.uk/led-lights/led-spotlight-bulbs/gu5-mr16-led-bulbs?virtual_dimmable=No&virtual_replacer_for_lamp_power_range=50W%20-%2059W&dd_beam_angle_degree=36
I've got a choice of 2700K (Extra Warm White), 3000K (Warm White) and 4000K (Cool White).
I take it 2700K would be roughly the same as the existing halogens, and 4000K (Cool White) would be too clinical for a bathroom, so it's just much of a muchness between 2700K and 3000K?
I'm erring towards the 3000K for replacements...
What colour temp do most people have in bedrooms/living rooms? (Also need to order some SES candle bulbs that are used in various rooms around the flat.)