24 inch Current USA Nova Extreme 2x24 watt T5 HO 10K/460nm European style high output T5 lamps Performance driven electronic ballast Slim design German parabolic reflector Energy efficientUL&gt;Simplicity by designB&gt;The Nova Extreme combines the best in both design and funct SlimPaq Actinic T5HOB&gt; (Saltwater models only) - A super actinic blue lamp emitting light energy req