A biological sample collection booth before (left) and after (right) the lighting change.

luminous flux (lx) (OSRAM, 2001). The Brazilian`s National Health Surveillance Agency gives architectural guidelines for healthcare environments in Brazil.

New lighting design The lighting was examined in biological material sampling booths. They are 2.51 m2 with 90 lux in average, the downlight with two discharge lamps, low-pressure compact fluorescent colour of 18 Watts and 827 colour, 36 watts rated consumption with approximately 10% extra of the reactor consumption 39.6 Watts per point, was changed for three new domestic manufacturing fixtures and imported lamp system, fitted with light- emitting diodes (LEDs) with 80CRI and correlated colour temperature of 3000 K with a total consumption of 10W per light and a point and service life of 25,000 hours. In order to reach these results, the average level of illuminance (lux) achieved in the workbench plan was measured. In this 2.51 m2

90 lux. The consumption of the area is of 15.79 W/m2

area there was an average of specific power.

The difference is in illuminance from

the light intensity to the site. What is more efficient and economical is the emission of light where there is full need of light, without waste or discomfort by glare, or unified glare rating (UGR). The light intensity is the direct light required to achieve what is considered excellent lighting for the lighting system is technically flawless and stimulating for the senses of the observer. Luminaires, certified by the National

Institute of Metrology Quality and Technology (Inmetro), present in the measurement of luminous flux results in total luminous flux, in luminous flux by the upper hemisphere, in luminous flux by the lower hemisphere, and in cumulative luminous flux, zonal flux and coefficient use. In this new lighting design note was

taken of the time that the optical curves of artificial light source and fixtures were


first used. For local electrical maintenance this information is important. Average or median of the lighting system is contained in the manufacturer’s technical catalogue. The lighting system, LEDs, will last more than 25,000 hours, but after 25,000 hours the fall of the luminous flux will become harmful to laboratory activity and will not meet the level of illuminance and average lux of the international and Brazilian standards. The luminance level found before

this study was 160 lux average. Our suggestion was to adjust the luminance level to 300 lux average inside the booth without loss of 80 CRI of artificial light source. This offered energy savings in addition to the extension of the electrical maintenance period on site by lowering heat transmission to the environment and reducing the consumption of the air conditioning system. To measure the heat generated by the lighting system, digital thermometers were used. For the suitability of illuminance we have used three fixtures from Interlight Lighting Equipment Ltd, model SKY 2626, a national manufacturer of 4000 K, 8CRI, with installed capacities of 25.W and 30.08 W/m2 10.14 W/m2

specific power similar to /100 lx. The return on

investment was 30 days, achieved through a reduction of energy consumption to the 2.51 m2


and a reduction in the need for electrical maintenance. The installed capacity, adequate to technical standards is 0.08 kW against the current that is 0.07 kW. The durability of the previous system is of 67 months and the current one is of 208 months. The difference between the return of the investment is

minus US$ 130.00 per month and the operational cost reduction is US$ 55.72 per month. The density of relative potency was of 26.6 W/m2 now 10.1 W/m2

to each 100 lux and is to each 100 lux.

Clinical analysis laboratory The laboratory had ten fixtures that were not sealed and were replaced by 21 sealed fixtures with adequate level of luminous flux and glare to achieve fundamental glare adequacy, through the control of the UGR of optical luminaires, so that the user has ergonomically correct visual and environmental comfort. For example, lamps next to each other without proper optics can cause loss of luminous flux in the upper hemisphere and in the hemisphere between them. A concentration of lost light that is not sent to the working environment is called shade of light. The development of the lighting project was aimed at a reduction of glare, via the new lamp’s UGR, and the new distribution of lighting at the ceiling and tables (complementary light). Prior use of the low pressure discharge linear lamp of 32 W, 4000 K and 64 CRI generated along an optical loss of light through the shade, were replaced by low-pressure, linear 32 W, 4000 K and 84 CRI discharge lamps. Mathematical results led to the conclusion that fixing the luminous flux of an average of 270 lux to an average of 556 lux offered no energy saving but this did fix the luminous flux of the site. Power consumption, to 105.42 W/m2


installed, in accordance with technical standards, is of 1.41 kW against the current that is of 0.67 kW. The durability of the system is of 100 months. The difference

One of the main factors of this research was to help improve the quality of planning the health facilities


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