The one on the left is the DR120 Darkroom. The one on the left is the homebox xl.

My growstore was carrying the homebox, then I went to get another and all they had was the darkroom.

I do notice small light emitting from my veg tent (darkroom with curved openings) when the light is on, so I can't account for it being light tight. I just exercise light discipline in the room with the tents so I know in my application it has no problems.

I have clambaked the homebox xl tho, and I can assure you it is light tight, i'm just not sure of their availability since my store switched carriers.

Both have the same hardware, venting and that stuff, but the Darkroom is silver mylar like on the inside, and the Homebox is white visqueen plastic like.

I like the Homebox better because it has extra layers of material everywhere there is a seam. Overlaps on the zippers and such. The only downside to it is you can only access it from one side. Not a biggie for me as you can see in the pic.

I'm reeeeeallly stoned so I hope this makes sense. I like the Homebox better, but they both serve their purpose fine. My only worry is if you will have light leaking in on a Darkroom, I would set it up and test it thoroughly before putting anything precious in it.