I have never had a Diall lamp fail prematurely, or at all in fact I & I have some that are over 4 years old now and are used regularly. Available from B&Q and Screwfix.
A lot may not fail but often the ones in the sheds are poor performance in terms of real lumen output and colour. Not saying they all are but many very inconsistent or true. If you shop around for the Enlights you can get them at a decent price. Remember the higher the Kelvin number the whiter the light
