Hey anyone else in UK having temp problems ... I&#...

You are creating your own problems by growing with 24 hour light and this is why your plants are signalling you your concern for them. Nothing on Planet Earth has evolved to live without sleep. Plants NEED a dark period every 24 hours to undertake certain metabolic processes that they can not do when the lights are on and they are in active mode. 18/6 is optimum for cannabis growth, cannabis can only grow so much during any 24 hour period and this growth tops out at around 18 hours, meaning running your lights any longer than 18 hours is basically a waste of electricity. 18/6 is not a random number and has been derived at through 80+ years of research into cannabis and is a scientific fact, not fiction. The reason they are doing amazing is your hybrid light system, especially the HPS light and not due to the 24 hours of light. Be warned, your plants will soon collapse and fail health wise if you do not give them a night period. They NEED sleep! Think of the 6 hours of darkness as 2 hours to recover from the day, 2 hours to rest and 2 hours to get ready for the day ahead. This is basically what happens during the night/dark period and is essential for proper plant function and health. I have been monitoring this site for years and the amount of effed up plants that were grown under 24 hour light IS amazing, with sickly plants and mutated buds without trichomes being the normal result. As I have already said, plants NEED a sleep/dark period every 24 hours to function correctly. If you are still sceptical, google "photosynthesis" to discover for yourself why a dark period is essential for plant health and development. Honestly, I am trying to save you from a lot of grief down the track, not reduce your yields or trick you in any way. I have been growing for 35+ years and think I know a lot about cannabis, (yes, a big head!), but not quite everything, however I do know one thing for sure, and that is cannabis does definitely NEED a sleep period of a minimum of 6 hours during every 24 hour period. Your plants will grow and yield just as much, if not more, once you go to 18/6, due to them having a normally functioning metabolism, a proper circadian rhythm and be even healthier than they are now. Trust me, I have seen plenty of failures by people growing 24/0, and the fact they only ever do it once, tells me I am correct in saying 18/6 is optimum and the best light schedule for auto flowers and photoperiod plants in vegetative growth. Could you imagine living for days/weeks/months without sleep? It is a recipe for disaster!! As for temps, here where I am, we get as high as 48 degrees Celsius in Summer, and periods of 40+ for 2-6 days at a time and multiple times each Summer, and as long as the plants are well watered, they don't seem to suffer in any way. I really hope this helps you in some way, and be kind to your plants and give them what they need.... SLEEP, and all your potential problems will be averted. Cheers, Organoman.