thats a very vague and indescript question. its not the wattage that matters, its the bulb type. a 42w compact fluoro will put out a shitload more light (in lumens) than your 250w heat lamp. when growing cannabis, the more watts the better, to an extent. a 1000 watt HPS/MH bulb is useless if you cant evacuate the heat it radiates. so it really depends on your fiscal and growing space situation.