My bulbs are 5 footers which are normally 80 watts. Shorter bulbs are not as high in wattage. I have read where using ice cap ballasts you overdrive the bulbs so I am guessing they are probably putting out between 90 and 100 watts per bulb. T-5 bulbs will last about 1 1/2 years, so I am figuring on replacing them at 1 year. I would really like to change out maybe 3 or 4 bulbs at a time on a 6 month schedule so I dont get hit with the big costs of 7 bulbs all at once and the lighting would maybe stay more consistant. That way I wouldnt have worn lights one day and the next have 7 new extra bright lights all at once. I have had just 2 t-5's over my 120 for the last month or so and my frogspawn, hammer and torch have never looked better. They are not as fond of the bright lighting in the 180 since the move.
Jeff