I'm going to be building a darkroom in my basement this summer (well its being built for me) anyway I currently have one fireball safelight (amber) and it illuminates my area fairly well (though i want a second) but its effective distance seems like 6-7 ft, after that things get real dark. Does anyone recommend another safelight other than that? or would three fireball safelights be ok for a darkroom thats about 10X10 (with a cut out in the one corner about that eats about 3ft on one end and 4 1/2 ft on the other)