Planning a 70 gallon tank

[Yenko]

The tank is 48" long, 16" wide and 21" deep. I plan to use 200w of light, 5X40w tubes. If I can, I will get Triton 6500K bulbs; anyone know of an affordable supplier? Paying $30 for 5 tubes every 6 months is expensive.

 

[George Farmer]

If I can, I will get Triton 6500K bulbs; anyone know of an affordable supplier? Paying $30 for 5 tubes every 6 months is expensive.

Are you sure Triton are 6500K? Why replace every 6 months? They have a life of 10000 - 15000 hours - I understand the spectral output changes over time but the plants adapt in my experience. I change my tubes every 12 to 18 months.

edit - The Triton bulb has a color temperature of around 8300K and the Ultra Tri-Lux has a temperature of around 6500K.