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    CONVERSION OF 1x11W CFL LUMINAIRE TO LED

    A study was proposed by our field engineer modifying a conventional 1x11W CFL mirror optic fitting to LED using 36 nos.

    0.2W (SMD 2835) strip LEDs (white) that was procured from open market.

    The payback calculation for the same is shown below:

    Details 11 W 36 x 0.2 W
    Type of lamp used CFL Strip LED
    Cost of modification using 36 x 0.2W strip
    LEDs including LED driver ** (L) - 136
    No. of Fittings 1 1
    Wattage (W) 11 7.2
    Operating Hours/ day (h) 14 14
    KWH per day 0.154 0.1008
    KWH per year for 285 days usage 44 29
    Cost per KWH (Rs.) 8.4 8.4
    Energy Cost Per Year (Rs.) 370 244
    Lamp Replacement Cost (Rs.) 70 0
    Total 440 244
    Annual Savings per fitting 196
    No. of fittings that can be modified (n) 66
    Total savings per year 12936
    Investment (L x n) - 8976
    Payback Period 0.69 years
    ie., 8 months

    ** Note: Since the modification was done by the maintenance staff at site no separate labour cost is added.

    Conclusion:

    1. The average service life of CFL is about 8000-12000 hours. As far as 0.2W LED is concerned, the manufacturer claims that it is more than 30000 hours.


    1. Partial replacement (in group of 3) is possible in strip LED whereas CFL needs total replacement.


    1. The average LUX measured (@1m above floor level) was 43 for CFL lamp while for this modified LED fixture it is 30.



    1. However, in locations such as restrooms, Toilet lobbies, Fire escape staircase, basement parking areas and all Lift lobbies (except CCTV covered areas) where the lumen requirement is not so critical, this modification can be done.



    1. To assess the reliability of the strip LED, it's driver and the modification work itself, a reasonable observation period of about 3 months may be required.



    1. A study on similar lines will be conducted on 2x11W CFL luminaire also.



    Kindly furnish your views.
    Attached Files Attached Files

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