In the decking? I wouldnt personally as it creates a weak point, talking from experience.
Yeah, just looking at small LEDs. I can see how 50mm+ could change thingsThats a small light isnt it? Mine are twice the diameter maybe more, might explain it tho.
Do you have any pics? What height have you fitted them at?Not deck lighting as such, but I use these in the garden and imo less hassle than cutting into decking.
LED Lamps