How big can I go while keeping the same light?

[OCDP]

The flame appears to be doing great... swimming back and forth, grazing on rocks, swimming in and out of the small caves I have..

I do know bigger is better.. obviously if space and some funds weren't an issue, I'd be going all out (trust me) But , I can't... and that's the harsh reality for me. I can't have a big tank.. not yet anyways. This is why I said to hell with it, let me just upgrade to the biggest I can go right now.. while using most of what I have.. (lighting being the #1)

I don't think I want 24" deep... I don't think the light will penetrate that well. I was thinking something like 18-20" max. It's so hard for me to visualize this as well, without actually seeing it.

I think the biggest concers I have right now are :

- Space.. I don't even know if I have enough length to fit in a 36".
- Lighting.. I want to be able to keep sufficient lighting over this tank. 150 HQI doesn't sound like much over 50g??? I can't add any other lighting as it won't work with the PVC mod.

So I want to be able to work around this... and obviously we don't know about the space, I'll measure that tonight though