30 gal lighting

jbj also makes a simalar light called the k-2 viper and it is also 150w 14,000k. i have this light on a 29g reef and it is plenty.
 
tagging along, I too am looking for a light to go over a 30 cube. I also would like to have a clam. Is 150 watt enough light, or should we go 250? Is 250 too much light (possibly harmful)?
 
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