On 11/5/2014 6:39 PM, Randall wrote:
>> so I'm thinking of replacing and considering LED.... I know the cost
>> difference but I like the low wattage and long life expect... my question
>> is the light output how do they compare watt for watt as far as flood light
>> illumination !!! are they as bright ?? fill me in led gurus
> Actual "watt for watt" they are much brighter, the difference is roughly 7:1.
> However, watch out for "equivalent watts" as they frequently don't tell the
> right story. Compare lumens, not watts.
The ratio for halogens will be a little lower. Halogens are more
efficient than non halogen incandescent. Probably closer to 5:1 but
still a significant savings. Randall is correct, lumens are a better
comparison but if you don't know the lumens a good guess is 100W LED
fixture.
Daylight bulbs are little more efficient than soft white. LED bulbs are
actual florescent because they use phosphors to improve the quality of
the light. A white LED without phosphors produce a bluish light,
guessing 7000K, so phosphors provide a color shift by absorbing the
7000K light and remitting 5000K. The higher the kelvin light color of
the bulb the higher the efficiency. Though I stick to a kelvin around
5000K. Higher than that you are might be wasting energy producing
colors that you can't see well; meaning though a 5000K and a 6000K might
put out the same lumens the 5000K will seem brighter because your eyes
can see all the lumens.
Peter T.
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