Growing in a Stealth Grow Box- How many plants?

Hey guys,

Wondering how many plants should be planted in this grow box.

Dimensions: 48 H x 16 Wide x 13 Deep.

Water reservoir: 2 or 2.5 gal. Has 6 holes for plants.

Lights: "600 watts" says company. 6 Cfl bulbs


So, would you plant all 6 plants in here? Or less?

Thanks for advice!