Most white grow LEDs are blue diodes coated with a phosphor, plus some red diodes. The result covers the red and blue plants use, with extra green and far-red added. Efficiency is what separates good lamps from poor ones. Good modern LEDs deliver around 2.5-3 µmol of light per joule.
They still make heat, but much less radiant heat than an HPS, so the lamp can hang closer to the plants. The heat that remains sits in the heat sink, so the tent still needs ventilation. Common designs are panels, bars and quantum boards. See all LED grow lights.
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