LED High Bay bulb 140W (120W and 150W are available too in E40 giant edison screw bas and 50W E27 niormal Edison screw. 6500K daylight is much whiter than mercury vapour, sodiujm vapour and metal halide bulbs used in Australian workshops. No need to change anything but the bulbs will survive longer and the power saving is also better when an electrician has bypassed the control box on the top of the light. General power saving is about 200W in a 400W fitting and another 60W if control gear has been bypassed. Instant start, no more waiting for warm up. Power surge protected. For internal use only.