A plain household lamp is less effective concerning the effective light output, but this would not affect quality.
Of much importance is however the size of a lamp and the transmittance quality of the bulb proper (clear or opal), actually the latter is finally a matter of size too... At least any enlarger that employs a condenser should be fitted with a lamp of proper physical size.
In the latter case the position of the lamp is of importance too.
Last edited by AgX; 01-07-2013 at 07:55 AM. Click to view previous post history.