So, you are looking to replace some of those old gu10 halogen light bulbs. Let me take away the mystery and guess work that you are forced to undergo. As I review energy products and energy usage in houses in a professional capacity, I can save you the cost and bother of buying different bulbs to see which ones work. I have spent hundreds of pounds trying to find one that I could recommend. – Now I am happy to show you one that works.Light Bulbs more