You can make a DIY 70W hqi for under 40 bucks..The bulbs on ebay are like 15-$20, they last 2 years+ depending on useage, and depending on your reflector and bulb could crank out 12000+ lumens. Also you could get a complete 70W HQI aquarium fixture for less than $150. and as far as LED goes, you can buy a complete fixture that cranks 5000 lumens for under 100 bucks.
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