it's fun to play with just to see how critters respond differently to the different bulbs, but you'll quickly begin to despise one of them. and not because one bulb will be so much better than the other, but because seeing one bulb changes the way your eyes percieve the other bulb. for example, by itself the iwasaki will look bright and perfectly white. but put it next to a blue bulb and it will look crazy yellow. and the blue bulb will then look bluer and probably dimmer than it would by itself. so when you sit down and try to decide which you prefer, you really need to run them just one at a time, and give yourself some time inbetween for your eyes to unadjust.
