Influence of materials on lighting unit's effiency

One of the most important items of directed illuminant is a reflecting body which essentially influences on a final effiency. By this illuminant  the received light output from the tube is between 25-35%. The rest of 65-75% is therefore received from  reflected  body respectively reflector. If the reflector is made of unsuitable material or it has irregular shape there will be substantial losses shown as excessive heat.

The  lower test demonstrates the influence of reflective material at HQI lighting unit. 

The lighting unit HQI 2x150W was tested under identical conditions. The only difference was in a reflecting body. At first in HQI 2x150W was original reflector made of anodised aluminium sheet Picture 1, Graph 1). Then in HQI 2x150W a highly reflective metal sheet with 95% reflection was placed (Picture 2, Graph2). Efficiency was inreased for 30%.

  Anodised aluminium sheet:

  Highly reflective metal sheet: