Josh Klavir wrote:
>Percentages in UVB bulbs is referring to the amount of UVB radiation that is
>being emitted for each watt of power being used. For example, if you have a
>20watt fluorescent bulb with a 5% UVB output, you will know that 1watt of
>power is used for UVB radiation, while the other 19 watts is pushing UVA and
>light in the visible spectrum.
>
If this were true it would allow us to directly compare the UVB output
of various brands of bulbs simply by looking at the wattage and
percentage claims. Theoretically, the 20watt 7% bulb produced by ESU
should produce more UVB then the 20 watt 5% bulb by Zoo-Med but testing
indicates that it does not. The reason these percentages are a great
marketing ploy but are otherwise relatively useless is that we are not
given what they represent. The figures are percentages of the total
lumen output that fall in the UVB range. Two bulbs of similar wattage
can have different lumen output levels.
Thea
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