Work out what your old lighting costs

Enter what is installed on site today and pick a replacement model. The calculator shows annual consumption and luminous flux before and after, savings in UZS, the payback period and the substation capacity you free up.

The calculator runs in the browser, so it needs JavaScript. Turn it on, or ask for a free DIALux calculation right away: our engineer will work out your site from your drawing.

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What is installed now

Type of luminaire installed now We fill in a typical power including control gear. You can change the value

Power draw of one unit, W Including ballast and control gear

Quantity, units

Hours per day

Days per year

What we replace it with

Replacement model Power and price come from the price list

How many new luminaires per one old one A DIALux calculation usually needs fewer than selected here

Tariff, UZS per kWh Default: 1,100 UZS per kWh including VAT for legal entities, in force since 1 June 2026, Cabinet of Ministers Resolution No. 243. If you have a contract or multi-rate tariff, enter your own

Model power ratings and prices come from the price list dated 30 March 2026, including 12% VAT.

What you get

Savings 114,048,000 UZS per year

Payback 17.7 months

Share of electricity saved

0% 100%

Consumption now: 190,080 kWh per year
Consumption after replacement: 86,400 kWh per year
Luminous flux now: 2,904,000 lm
Luminous flux after replacement: 3,120,000 lm
Change in flux: +7 %
Power freed up: 28.8 kW
New luminaires: 120 pcs
Luminaires at list price: 168,000,000 UZS

The flux of the old luminaire is the nominal output of new lamps from manufacturer catalogues, before losses inside the housing and before lamp depreciation: on site it is lower, so the real drop is smaller than the figure above. The flux of the new luminaire is taken from its 2018 IES file.

Default tariff 1,100 UZS per kWh including VAT for legal entities, in force since 1 June 2026, Cabinet of Ministers Resolution No. 243 of 15 May 2026; if you entered your own tariff, the figures are based on it.

A rough estimate. The accurate figure comes from a DIALux calculation on your drawing: it is free and accounts for mounting height, the required illuminance and the real number of luminaires.

Get an accurate DIALux calculation

Savings per year 114,048,000 UZS

What the calculator does and does not count

It uses one formula: quantity × power × hours per day × days per year. The old luminaire power includes control gear.
It counts luminous flux before and after the replacement: quantity × flux of one luminaire. Old-lamp flux is a catalogue nominal, new-luminaire flux comes from the IES file wherever there is one.
It does not account for mounting height, the illuminance required by ShNK 2.01.05-24 or uniformity: because of them the new luminaire count is usually lower than the old one.
It does not include installation, cable, breakers or removal of the old luminaires.
It does not include maintenance and lamp replacement, although for mercury-vapour and sodium lamps that is a noticeable cost.
Prices come from the price list dated 30 March 2026 including 12% VAT; the Prom 600W price is set per project.

The default tariff of 1,100 UZS per kWh including VAT is the price for legal entities (consumer groups I, II and IV) under Annex 1 to Cabinet of Ministers Resolution No. 243 of 15 May 2026, in force since 1 June 2026, checked against the text on 17 September 2026. The resolution has no time-of-day zones or voltage-level steps; if you have a contract or multi-rate tariff, enter your own in the calculator field. Resolution text on lex.uz

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