GL6 Spotlight bulb - 12 Volt / 100 Watt. For use with SL170 series spotlights. GL6 bulb specifications. SL170= 530,000 candle power. Vertical filament bulb = Circular light beam. Note: 100 watt bulb increases battery power consumption significatly. Note: 100 Watt bulbs are NOT to be used with 140 series lights (will cause heat damage on 140 series)