I am absolutely satisfied with this product, the only small problem I would like to respect the bulbs (hence my rating a bit mean that I assume). It is indeed not possible to change the bulbs of this type of product. I contacted Philips customer service in order to have more information. Indeed, the answer was clear. The product's life is on the product data sheet and is estimated at about 7 years. Conclusion: if it works more you are good to buy a new model, which I think is still a bit much for a radio alarm clock, dawn simulator course at nearly 140 euros. A little disappointed that side. I just hope my product hold a little over 7 years, and if this is not the case I imagine badly put such a sum for such a product, if it is still impossible to change light bulbs .