Nice, did not know there were 16 inch fixtures. Learn something new every day.outlaw said:2 that I've found. 16" fixture with 15" bulb.
16" fixture, 8w T8 bulb
16" fixture, 14w T8 bulb
Welcome to Fishlore!
outlaw said:You may be able to use something like
This Details found HERE.
Dimensions Small- 7.8 x 17.7 x 3.5 inches (2 bulb; upto 26w each socket)
Dimensions Mini- 5.9 x 11.8 x 3.5 inches (1 bulb; upto 26w)
Dimensions Nano- 8 x 3.5 x 5.9 inches (1 bulb; up to 26w)
Dimensions- 18.3 x 5 x 4 inches
With either of them, just make sure you keep the glass cover over the tank as these are not waterproof/resistant.
Exo Terra also has a dual fluorescent fixture but is only 14wx2. Link
Dimensions Small- 17.7 x 3.5 x 7.8 inches (2 bulbs (15inch); upto 14w each)
Looks like the Exo Terra MinI might be a good option as it allows some customizing of wattage of bulb and stay within the dimensions. It looks to be black but painting a brown that matches may help.