1.00    Project Outline

1.01       General

This project is mainly referred to the replacement of LED luminaires from level 10 to 30 which include:

1.02       Lift lobby lightings

Both passenger and fireman lift lobbies as well as public washroom are uniformly configured with 5 inches recessed downlight fitted with 1 x 18W CFL lamp of E27 base. According to the site survey, the plastic trim and frameworks of the existing fixture are mostly aged and not recommended for reused. In this respect, 9 watts LED recessed downlight with 120mm cut-out size are recommended as replacement that approximately 56% saving of electrical power could be expected.

1.03       Corridor lightings

 Generally, there are three types of recessed troffer being configured for corridor, namely

• 71 sets of 4 feet twin-tube standard fluorescent troffer;
• 41 sets of 4 feet twin-tube fluorescent troffer fitted with 2 hours battery pack, and
• 2 sets of 2 feet twin-tube standard fluorescent troffer.

2.00    Luminous compatibility

• 18W CFL Recessed downlights

The existing light source of recessed downlights are uniformly fitted with 1 x 18W Osram Delux Superstar CFL (2900K). It could be simply replaced by NOVETE® 510B slim-line recessed LED downlight. A mock-up sample had been fitted at site for evaluation purposes. The table below exhibits the basic data showing the luminous compatibility:

2.02       4 feet twin-tube fluorescent recessed troffer

Generally, fluorescent lamps could be simply replaced by NOVETE^® 20W tubular LED lamps on one-to-one replacement basis. Simply remove the starter and fit the tubular LED lamp to the existing T8 holders provided by the fixture to accomplish the installation.  The table below exhibits the basic technical data of fluorescent and tubular LED lamp for comparison.

3.00    Energy saving evaluation

3.01      Operation schedule

According to the MCST directive, half of the public area lighting within the building are operating 24 hours. That means to say the operation hour insofar as this project is concerned may be scheduled for an average of 18 hours daily throughout the year.

3.02      The proposed replacement

By scrutinizing the finding of the existing lighting, essentially three types of luminaire would be required for replacement, namely

[a] 5” 18W CFL recessed downlight (2900K)

[b] 4 feet twin-tube 2 x 36W fluorescent troffer

[c] 2 feet twin-tube 2 x 18W fluorescent troffer

This luminaire may be omitted as it is insignificant insofar as this project is concerned.

3.03      Power consumption of 5” recessed downlight

Total 389 units of NOVETE^®  51048-115W09K3 compact LED recessed downlight is proposed for  replacement same quantity of 1 x 18W CFL downlights (see section 4.02(a) above) .

3.04      Power consumption of 4 feet twin-tube troffer

It is proposed that the 20W tubular LED lamp (model #D83100S-W20K5) may be used for one-to-one replacement of 36W fluorescent lamp currently fitted to the 112 units of twin-tube troffer (see section 4.02[b] above). Simply disable the fluorescent lamp starter and positioning the tubular LED lamp to the existing T8 holders without going through the hassle of re-wiring works.

4.0      Payback of investment

Obviously, there are two basic elements for justifying the payback of investment, i.e. (a) saving of power consumption and (b) cost of maintenance.

4.01      Capital expenditure

For the purposes of this project, the following luminaires may be put up for bidding:

4.02      Saving of electrical power

Total 61347.97kW of electrical power saving could be expected after the replacement, which include

Further energy saving measure would be possible if half of the luminaires are configured with NOVETE® microwave dimming sensor (model #TR-D811). The dimming device could is programmable. Luminance of luminaires may be reduced by 50% if no moving objects being detected within the coverage area of approximately 5 meters radius.

4.03      Saving of maintenance cost

The warranty period provided by the LED lighting supplier will be two years from date of completion for replacement. Therefore, it is suggested to set two years as maintenance cycle. In this respect, there would be zero cost incur for repair and replacement of LED light source. Whereas, the following assumption may be made for maintenance cost projection of the existing light source, which include:

• 18W CFL: The life span could be as short as 6000 hours if it is frequently turn-on and turn-off. Practically, lamp of this kind may have to be replaced minimum once in a year. The cost of maintenance in this respect may be projected @$6.00 per units, thus a budget of $4,668 may have to be provided for the repair and replacement during the maintenance cycle.
• T8 36W fluorescent tube: It usually requires replacement after 3000~4000 hours due to either quick attenuation or damage of the built-in filament (black end of tube). Thus, it may cost approximately $15.00 per tube within the maintenance cycle inclusive of manpower cost. In this case, the cost of maintenance relating to T8 fluorescent tube may be project for an estimated total of $3,360 for the total of 224 units of tubes within the maintenance cycle of two years.
• In conclusion, the cost of maintenance may be projected approximately $8,136 during the maintenance cycle for the purposes of justifying the investment.