I was thinking of using an 'F84 for serial controlled 240Vac lamp dimmer. Does anyone know how many steps you need for really smooth fade up/down ? I thought 256 discrete levels (1 byte) would do but I imagine that some sort of look-up table is required so that 'level 127' for example will actually be half brightness due to the lamp's non-linearity. Levels 0-255 makes it easy to assign min/max/etc levels as a byte each. I realise that each type of lamp will have a different power/intensity curve but is there a general purpose 'average' type of curve available out there ? Regards... _________________________________________________________________ Dave Duffy Audio Visual Devices E-mail: AVD@uq.net.au Phone: +61 7 38210362 Facsimile: +61 7 38210281 Unit 8, 9-11 Trade Street, Cleveland, Queensland 4163 Australia _________________________________________________________________