ErligpowhtDirect via Amazon offers its Erligpowht 45-watt Hanging LED Grow Light for Indoor Plants for $27.99. Coupon code "ZX7EHPVN" cuts it to $22.99. Plus, Prime members receive for free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $7.77.) That's $5 off and the lowest total price we could find. It purportedly improves plant growth through the use of 225 LED lights (165 red and 60 blue) and features a lifespan of up to 50,000 hours.