I don’t know what kind of clip on grow lights you have already, but I’ve had great success with this: https://www.amazon.com/iPower-24-Watt-Multi-Spectrum-Waterproof-Flowering/dp/B01MCZ63VC/ref=mp_s_a_1_12?ie=UTF8&qid=1544986818&sr=8-12&pi=AC_SX236_SY340_QL65&keywords=ipower+24+grow+light