Helvar LSI-70T1 – Limited Stock

LSI-70T1 Technical Information

Lamp type

High pressure sodium (W) 35-70
Metal halide (W) –
Ceramic metal halide (W) –

Technical Specification

Max. contin. lamp current (A) 1
Cut out time (min) 2
Operating Voltage (V) 198-264
Cut-out voltage (V) < 170
Ignition voltage (kV) 1.9 … 2.3
Impulse width (us) 2 (1.5 kV
Phasing (°el) 60-90 / 240-270
Pulses per half cycle 2
Max. load capacitance (pF) 200
Internal losses (W) <1.0 25°C; 1A
Max. housing temp. (°C) 105
Min. ambient temp. (°C) -30
Weight (g) 105
Dimensions AxBxC 88x34x28

LSI-70T1 Connection diagram

LSI-70T1 Dimensions

Length 88mm
Width 34mm
Height 28mm

High-Pressure Sodium (SON) lamps are highly efficient, long-lasting discharge lights widely used for streetlights, parking lots, and industrial spaces. They emit a characteristic golden-yellow light and require a dedicated ballast and igniter to operate. While highly reliable, they have poor colour rendering capabilities.

Key Characteristics & Technology

How They Work: SON lamps contain a narrow, translucent aluminum-oxide ceramic arc tube filled with xenon gas and a sodium-mercury amalgam. When voltage is applied, the xenon ionizes, vaporizing the mercury and sodium to create an intense arc discharge.

Light Spectrum: They produce a distinct, broad-spectrum yellow/orange glow at a warm color temperature (around 2000K). Because the colour rendering index (CRI) is very low, it can be difficult to distinguish colors under their light.

Lifespan & Efficiency: SON lamps are incredibly efficient, often achieving over 130 lm/W, and boast an exceptionally long lifespan, sometimes lasting up to 36,000 hours.

Start-Up Time: They are not instant-on. They go through a distinct warm-up routine where the light transitions from a faint pink/blue to green, finally shifting to a bright yellow-orange as the pressure increases (pressure broadening).

SON lamp ignitors generate the high-voltage pulses (up to 5kV) required to strike an electrical arc and ignite high-pressure sodium vapor. Depending on your lighting system, the ignitor is either a standalone electrical component wired alongside the ballast, or built directly into the lamp itself.

Key Differences: Internal vs. External

Internal Ignitors (SON-I): The starting circuitry is housed inside the lamp itself. These are designed for circuits with only a ballast; if you place an internal-ignitor lamp on a circuit that already has an external ignitor, it can cause damage or flickering. You can easily identify these by checking for an “I” printed within a small triangle on the lamp glass.

External Ignitors (SON-E / SON-T): The ignitor is a separate black or white component mounted on the gear tray. These lamps feature a “E” stamped on the glass.

At Helvar Components we create intelligent and energy-saving lighting components. We are a strong independent company with sustainability values built into our core. Our commitment to the industry has made us a leading provider of LED lighting components.

Our origin is in Finland, where today we have not just our headquarters, but our unique competence centre in Karkkila. Located just outside of the Helsinki Capital area, this centre includes decades worth of lighting experience, product developments, manufacturing, and global distribution warehouse. Worldwide, we serve our customers locally with our international sales offices and global network of partners