An HPS bulb produces 60-140 lumens/watt, depending on the wattage of the bulb. A metal halide bulb produces 60-125 lumens/watt, depending on the wattage of the bulb. A CFL produces 44-80 lumens/watt, depending on the wattage of the bulb. A fluorescent grow light produces 33-100 lumens/watt, depending on the form factor and wattage. Variable devices are variable wattage, variable voltage or both. Low wattage halogen lamp arrays are widely used by monitor lizard keepers. Variable devices permit setting wattage, voltage, or both. These power supplies usually have lower wattage ratings. USB Charging ports should also be clearly marked with capable power wattage. One other problem can happen with the wattage rating of the power supply. Solar panels also vary in wattage systems. IPG pursued raising the maximum wattage of fiber laser technology. Type Ia supernovae are the cosmic equivalent of cars with the same wattage of headlights. The broad-band responsivity, is then just the signal weighted by this wattage. Ross still commanded plenty of star wattage.