If just a couple inches difference this will work perfectly. If your sump/ refugium is more than 12x 12 and deeper than 8 2-h80s are recommended or upgrade to the larger a160 tuna flora or even the h380 tuna flora. The key to a refugium is to maximize the growth of macro algae to remove excess nutrients.
If you just keep macro algae alive and growth to a minimum, nitrate phosphate and other organically will be removed at a minimum rate. So use more light than needed for the hours that your main lights are off. So most likely you will be using them at night. The item "KESSIL H80 TUNA FLORA & GOOSENECK MOUNT HANDS DOWN BEST REFUGIUM GROW LIGHT LED" is in sale since Friday, December 7, 2018.
This item is in the category "Pet Supplies\Fish & Aquariums\Lighting & Bulbs". The seller is "retek71" and is located in Alhambra, California. This item can be shipped worldwide.