The simple solution to orchids burning is moving them further away from the source of light. This usually means you can grow more orchids, which is typically a good thing. The other solution is simply running the lights for less length of time. (ie 4 hours instead of 10)
Are your plants in a window?
Also many orchids can grow decent vegetation under low light levels, but won't have enough juice to bloom. The color of the leaves will tell you.
If you switch power of lighting rapidly, the orchids won't have a chance to adjust and will burn and die. If you slowly slowly increase the amount of light, they will be fine. If you switch from t10 to t5 start at 1 hour of light twice a day, and slowly ramp it up (1 hour extra of light every 3 days or so). Once you start seeing the leaves dotting purple, you've reached the max amount of light they'll want to have.
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