The enlarger lamp is probably not bright enough. I use a R-30 reflector flood (45 watt) from any hardware store. The 300w are expensive and usually you'd have to special order. I filter the amidol with a filter flask and DE (do not ask me to spell it) first filtration. Second with coffee filters no DE. See the AZO forum. I would not recommend the Chinese Amidol for a first time user because of the extra work. After the first fix wash before the second to remove the stain.