Quote:
Originally Posted by Fusion_power
A few caveats should be inserted here.
1. An overdriven fixture does 3 things: uses more electricity for light output, burns the bulb phosphors rapidly, can cause unacceptable electronic 'noise' with some ballasts.
2. The same effect can be achieved in many cases by using more fixtures with more bulbs in a given space.
3. Reflectors can dramatically increase light intensity to plants even with normal fixtures
4. Even overdriven fixtures do not produce enough light for some plant situations. This is why metal halide systems are available.
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DarJones
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I am in agreement with everything said with additional comments:
1. As I said, it will be less efficient and bulb life will be shorter; however, not by much.
2. OD lamps is only for those who don't want or don't have the room for more fixtures.
3. Most lamps already have reflectors. I do use aluminum self-adhesive roofing tape (HD) on the white reflectors to increase reflectivity.
4. That's why I use OD fixtures to get seedlings to about 8", and switch to MH to get then to about 18" tall.
dcarch