- Expensive to purchase
- Require expensive ballasts
- Expensive to operate
- Short limited life spans
- Hazardous materials
- Fragile
- Excessive heat
- Limited K values
After quite a bit of investigation I have come to believe there are two types that stand out
- Ceramic Metal Halide (CMH)
- LED
Neither is cheap to purchase and at this time LED is very expensive, but I just found components to build your own LED light bar which exhibit none of the problems Ive listed above!
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A Standard LED Grow Light |
The components to build and equivalent 400W 36000 lumen grow light at less than 1/2 the cost!


This is just one of many LED K values that are available and a wider spectrum could be made by including other K valued LED Chips.
12V power supplies are very inexpensive thanks to the computer industry.

Total cost about $200
While searching for your components you may find some bulbs are listed in mcd rather than lumens. Here is a converter calculator to help you design the grow light you wish to build.
Coming Soon! New LED technology
http://www.bbc.co.uk/news/technology-22106718
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