LED lighting guides

Lighting basics · 2 min read

IP and IK ratings explained for outdoor LED lights

IP65, IP66, IP67 and IK08, IK10: what the digits mean, which rating each application needs, and why a rating certificate matters more than a label.

Lighting basics · 2 min read

Lumens vs watts: how to compare LED lights properly

Watts tell you what a light consumes, lumens tell you what it delivers. Learn how efficacy (lm/W) separates a good LED from a cheap one, with replacement tables for HPSV, metal halide and CFL.

Design & sizing · 2 min read

Solar street light sizing: panel, battery and autonomy for India

How to size the LED wattage, solar panel and lithium battery of a solar street light for 12-hour operation with two to three days of autonomy during the monsoon.

Design & sizing · 2 min read

Choosing LED street light wattage by road width and pole height

A practical table matching road width, pole height and spacing to the right LED street light wattage, with the IS 1944 lux targets behind it and the mistakes that cause dark patches.

Design & sizing · 2 min read

Recommended lux levels by application (NBC 2016, IS 3646, IS 1944)

How much light does a warehouse, factory floor, office, road, car park or stadium need? A single table of recommended maintained illuminance for India, and what the numbers mean on site.

Standards & compliance · 2 min read

How to read an LM-79 photometric report

An LM-79 report is the only independent proof of an LED fixture's lumens, efficacy, colour and distribution. Here is what each section means and the numbers to compare between suppliers.

Standards & compliance · 2 min read

BIS CRS registration for LED lights: what buyers should check

Which LED products need BIS Compulsory Registration under IS 16102 and IS 15885, how to verify a registration number, and what a tender should ask for besides the BIS mark.

Buying & GST · 2 min read

GST on LED lights: HSN codes, invoices and input tax credit

Which HSN code applies to LED bulbs, luminaires and solar lights, how GST appears on a HiLums invoice for intra-state and inter-state buyers, and how businesses claim input tax credit.