Lighting for 4ft

Hi guys i bought a 39W HAGEN - GLO T5 HO light ballast for my 270 litre.I want to now if this is enough for medium -high light plants without Co2
and want a very well planted tank. If it isnt enough then what will i have to do by not getting Co2 for them to grow and be healthy.
The tanks specs are
Heigth -51 cm
length-120cm
width-46cm
here is a pic of the tank now

thanks
mc1

 

Hi mc1,if you have a double ballast,i.e. 2x 39 Watt,you'll be good for medium light,but your tank is very deep,so you might have some difficulty reaching the substrate with enough light.And when you have a large planted mass,you'll have allot of shadowed parts.
If you carefully select the plants,you can do well.Dosing with Seachem Excell,liquid carbon,or any other suitable carbon additive,will greatly improve growth

 

Yes i have flourish excel it works well and my plants are really doing well but i do want a big plant mass so i will probably get another light in a few months maybe a 54W hagen T5 GLO
thanks

 

mc may ask what you payd for it and where you got hold of it?