Something that you could do is an experiment based upon lighting.
If you took a group of orchids (whatever they may be, but for true 'experiment consistency' they should all be the same species/hybrid, etc) and you could test to see if certain light ranges are more beneficial or how much of a certain light range they receive to help growth of the plant.
For example, let's say that you have 3 phals (same species or hybrid). The first phal is going to be the control and be only grown under a "standard" light (whatever you choose) for 12-14 hours. The second phal is going to be the first increment that will have the standard light, in addition to 1 red-spectrum centered light bulb. The third phal is going to be the second increment and have the standard light and 2 bulbs of the red-spectrum light.
Another possibility is to use the same setup that I described above but in the following manner:
1st phal- standard light
2nd phal- standard light + 1 red-spectrum light
3rd phal- standard light + 1 blue-spectrum light
4th phal- standard light + 1 red-spectrum + 1 blue-spectrum
*Of course the amount of water (or watering time), temperature, potting medium, etc. should all be the same.
**For experimental accuracy, you could place the phals in a cardboard blind-surrounding 3/4 of the plant to help block out other sources but still allowing 1 side to be open for air flow. A way to get around the blind would be to grow in a dark room, like a basement, etc.
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