Went to another shop as I don’t actually remember where I bought the first! Found exactly the same bulb, 150 watts, cost.....wait for it...£35.!!! Don’t remember the cost of the last one as I had bought a lot of bits and pieces at the same time. I asked the assistant how long it should last and she said 6 months! BUT bear in mind this is in 24 hour use as a reptile environment warmer. So being used for a smoker even once a week for me, at the most, for say 12 hours max a smoking, it should last way longer. You do the maths, I am too lazy! But you bet I will keep the new receipt safe and sound in the original box!