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Lumens is a measure of light output. often measured at 1 foot from the source. While the color temp of a bulb does not always = light output in the case of HIDs there is a correlation.
in order to achieve the different color temps different coatings and or materials must be used. each of these affect the total lumens produced. it is a trade off between brightness and frequency of the light waves (color temp).
technically using a reflector would only change the directing and focus of the light not its actual lumen output. it does add more light in the direction we want it but the total light being generated does not change, just where it goes.
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