Can I get a specification from Xera Tech for both highway and village roads in the same project?

Yes. Many state highway projects include both open highway sections and village settlements. Xera Tech can provide a split specification with highway-class lights for open sections and village-class or decorative lights for village areas - with photometric reports for both, ensuring both sections meet the applicable IS 1944/IRC standard.

What is the minimum wattage solar street light that meets IRC requirements for a 2-lane NH?

For a 7m wide 2-lane NH (M3 category: 10 lux maintained, Uo ≥ 0.30): on 9m poles at 35m staggered spacing, a 60W solar LED achieving 130+ lm/W efficacy meets the standard. Verify with a photometric report using the specific product's IES file - 60W is indicative, not universal, as it depends on the luminaire's beam distribution.

Is the ERDA test report required for village-class solar street lights in government tenders?

ERDA test reports are increasingly required even for village-class lights in state government tenders, though BIS certification alone may be sufficient for some gram panchayat direct procurement below the threshold. For any project above ₹10 lakh or funded by MNRE/state agencies: ERDA test report is strongly recommended (often mandatory). Xera Tech provides ERDA test reports for its complete product range.

Solar Street Lights - Highway vs Village Specification Compared

Side-by-Side Specification Table

Why Highway Specs Cost 3–4× More

The cost difference is real and justified: Higher LED wattage (3–4×): most of the cost difference. Larger solar panel (3–4×): tracks the LED wattage. Larger LiFePO4 battery (3–4× energy capacity): linear cost scaling. Heavier pole (structural calculation required): 2× weight, 1.5× cost. IP66 vs IP65: 10–15% premium. Higher surge protection: 10–15% premium. Highway-class beam optic tooling: modest premium. ERDA test report requirement: adds project qualification cost. For procurement officials: never compare highway-grade bids with village-grade products - the specifications are categorically different and the prices reflect this.'

Common Specification Mistakes

Using village-spec solar lights on a highway: the most dangerous mistake. 20–30W solar lights achieve only 3–5 lux at 9m pole height on a 10m road - far below IS 1944/IRC requirements. Drivers can be killed by inadequate visibility at highway speeds. Using highway-spec solar lights on village roads: unnecessary cost, 3× budget overrun, donor or procurement funds wasted. The village road already meets IS 1944 P4/P5 requirements with 20–30W lights. The correct approach: classify the road accurately (using IS 1944 or IRC SP-72 categories), then specify the appropriate solar light for that category.

Transition from Village to Highway Lighting

On state highways that pass through villages, the road transitions from highway to residential to highway. The correct approach: use highway-spec lights (60–80W, IP66, high-mast) for the open highway sections. Use lower-spec decorative LED on the village main street section (where speed is lower, pedestrians are more common, and aesthetics matter). The transition zone (50–100m) should use intermediate-spec lights (40W, 6m pole) to smooth the adaptation of drivers' eyes between the bright highway and dimmer village road. This zoned approach is part of IRC's guidance on village section road lighting.