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But it is continuously oversold because it is also relatively costly and can be difficult to install. Reflectors can be a useful tool in your kit when used properly. However; claims made by reflector salesmen ask you to believe that 50% of the light output from a fluorescent lamp is absorbed by the fixture. This is not so. Lighting 39 This kind of wild claim is easy to debunk when you know the simple dynamics of light reflections and the formulas for calculating fixture output. We have already discussed LD and DD.

Better light for half the cost! But remember, you didn’t change the location that caused the dirt and you didn’t change the policy of relamping on burn out, so the same factors exist that made the 70% LD and 70% DD assumptions correct. Therefore, in about a year, the LD and DD will return and you will be back to 50% light output. But there’s one big problem. You started with 50% light output! Fifty percent of 50% is only 25%. The only way out for a plant engineer is to maintain your system at its peak performance until you can get your resume back out on the street.

The fixture manufacturers have gotten their acts together and designed new fixtures with the proper ventilation and optical reflectors that result in optimal output. Quite often these fixtures have a considerably higher CU than the existing incandescent fixtures and therefore require less lumens to produce equal RLO. In these situations you can reduce watts even further by reducing the lumen input. That is what I mean about an informed decision to conserve. Only you can decide if the two questions (Will there really be a savings?

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Choosing a cooling system by Energy Efficiency Victoria

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