I use a 85 watt flood light that only uses 19 watts of power. Its a 5100k bulb and Ive been using them for 2 years and my cheato has done well with it. You can buy this bulb at home depot.
I use the coralife 2x9w 6500k, it's really compact, 10x5x2 which fits over the algae area of my fuge perfect, they make them larger, this one cost me maybe $22 online
i use a 75 watt plant growing light from lowes, and every 2 weeks i have to pull a huge hand full of cheato out casue it grows so thick and fast
total cost $7