Is it a good idea to always have a filter in place when printing with MG paper? I've just been using the light straight from the lamp and it seems to be giving me perfect contrast every time. I don't know what grade it is or if it's even perfectly white light, but it seems to work well. It's not grade 2 since grade 2 graded paper always comes out too contrasty, but MG paper without a filter works great. Will this eventually lead to inconsistent results or is it ok to go without a filter?