Another option u can try is to source directly from the supplier ... most of the budget HPS systems are MADE in china...and u will find that walmart or home depot or wotever is only a retail outlet for some HUGE oem manufacturer in china... if you get enough people together...i wouldnt be surpirsd youll be able to get some good deals direct from manufacturer.... Try Alibaba.com or something similiar to that...and i wouldnt discount led's but a the current price..ud be looking at way more than the same Yield/effect of a cheaper HID option... i am a firm believer that if you get the right LEDS, and enough wattage of LEDS..youll be able to outdo HPS some day...as in G/Watt consumed ratio...