The attractive thing about LED lights when they first appeared were the very low wattage, and hence low running cost. But the ones I tried, including a 275 watt job whichI had almost touching the leaves failed in one important respect - the growth rate was poor. Then I read , somewhere on one of our forums, that the best LEDs achieve 4 lumens per watt, whereas my 600 watt metal ballast "twin spectrum" lamps are way, way beyond that ( and are the basis of the results I am showing with my cattleyas) and moreover cover a much wider area of bench too. I tried half a dozen different LED jobs, and they all ended up at the local recycling facility aka rubbish tip .