The higher wattage units need good heatsinking, and I believe that is easier done with integrated units, where the "bulb" aka driver is not replaceable. I've al

The higher wattage units need good heatsinking, and I believe that is easier done with integrated units, where the "bulb" aka driver is not replaceable. I've also thought of making my own, with a strip of aluminum and mounting 1W/3W emitters to it myself. Easy enough to drive them at whatever wattage you want, and maintain good thermal properties.