While it does depend upon the price of energy, the savings on LED lamps are so great, that despite their additional purchase price, they deliver overall savings in just a few months, if not weeks. The other point about dimmable LED lamps is that they often require a new dimming control, which adds to the purchase cost. I have only one dimming control in a room that is rarely used at night so I've not bothered to replace those lamps.
Current Eon Next and EDF customer, ex Zog and Symbio. Don't think dual fuel saves money and don't like smart meters. Chronologically Gifted. If I offend let me know by private message, but I’ll continue to express my opinions nonetheless.