Something I have though about but haven't looked into further would be to use a pre-molded fiberglass shower stall. There is a drain in the bottom and holes for plumbing hardware.

E. L. Mustee & Sons - DURASTALL® Shower Stalls

Estación seca: That is actually a quite cool idea. Never thought of that. Would be pretty funny to have a shower stall in the middle of my living room, but who cares. :) Perhaps I should've thought of that before I bought my rack!

They also make stalls intended to fit into the corner of a room. Most of your rooms probably have four corners.... :)

Yes, I saw that. And my room definitely have four corners. I can't find any pricing, though. I've looked around on the webs for the pricing of shower stalls in general and they're not cheap!

We can buy them through hardware stores. They are often special order items. I'm considering them because the cost of a shower stall is much less than the cost of a home-made enclosure leaking.

Why would it leak?
I'm trying to make my home-made greenhouse fairly cheap, since I don't have a lot of money. It's not done yet and I can only make an estimate on what it has cost me to this point, but I feel like a shower stall would be more expensive. Do you know what a shower stall cost on average-ish?

I don't know in Denmark. This is one in the US:
Durastall 32 in. x 32 in. x 75 in. Shower Stall with Standard Base in White 68 at The Home Depot - Mobile

Oh well, that is pretty cheap actually. I think that's about the amount of money I've spend so far on my rack, two fans, a little lighting (need more), some cables, etc. I could've really went for the idea if I hadn't already bought half the things I need, but it's certainly a cool idea! If you ever buy it and make a greenhouse of it, do tell! :)

For the plants you have I would not worry too much about the numbers and work on the hight and amount of time the light is on for. Cymbidiums might be hard to grow under lights they really are more of an outdoor orchid. I gave up on mine. I do still keep the other plants you keep under lights.

I grow under the Red and Blue LED lights they are great. Yes it looks weird but the plants seem to like it. Who am I to tell them what I like. My new growth is growing really well since under the red and blue LED. I also have an LED fixture that is daylight/white light. I only have about 3600 lumes per light fixture. My Beallara got some purple leaves from the red and light Led. That means that plant was getting the max light. My white LED light is 6500K.

Many orchids really do not need that much light. Adjusting the hight of the light will effect the amount of light intensity. Also the amount of time the light is on for. So you can get away with less if you know how to adjust things.

How far away will the plants be from the bulb?

I am just growing mine under lights for the 9 months the other 3 months they go outside. So my indoor grow space is not so closed in but I use reflective insulation that also helps add extra light.

Here is my set up.

http://i273.photobucket.com/albums/j...psn2n72j9o.jpg