I bought 2 table grow lights through another company, each with two bulbs, that I used to grow watercress. 
They were expensive but began to burn out in just a few months. The bulbs cannot be replaced, because they have cords attached in the lamps. 
I searched for adjustable table lamps that could use LED bulbs and found the great desk lamps on Wayfair. I ordered 2, used LED bulbs in them and  love them! The watercress also loves them! No more bulb burnout problems.