20 watt halogen bulb in a 25 diameter reflector head which produces a concentrated beam of light, more powerful than incandescent and with a light that resembles natural daylight. Model 6930: Clamp-on model with 34 reach and 30 arm. White in color, to match any decor. 6769300. Model 6330: Desktop model with 34 reach and 30 arm. 6763300. Model 6360: Floor model with 64 reach and 60arm. 6763600.