A 20w halogen bulb blew in my under cabinet lighting bar. I replaced the bulb with a 1.1w LED / 10w conventional. It worked but the 2 bulbs were different shades. When I added the 2nd 1.1w LED, it won’t work. When I turn it on (connect via wall switch to mains) it literally flashes on once and goes off. The bulbs have not blown because if I switch it on again, the bulbs will flash quickly once more and go off again. Any ideas how I can get this to work? Cheers