The 721 Series SRCL LED lamp is a solid-state replacement indicator for the conventional 100VAC 33W filament bulb (LU Part no. 24611/237) used in the signal head units for London Underground railway signalling.

The light source is generated from a cluster of high intensity LEDs mounted in a bespoke and coloured UL94 V0 rated housing fitted with a B22d 3-pin lamp cap to make it a direct replacement.

The units are designed to meet the highest LU Railway Standards as defined below:

• EMC to 1-196, 1-222, E7001, E7002, E7202 and EN50121-4
• Shock and Vibration to E7202 and BS EN 61373
• Humidity to E7202
• IP55 Protection to BS EN 60529 and E7202
• Colour Signal Class to BS 1376:1997 at a nominal 25 °C

The 741 Series LED lamp is a solid-state replacement indicator for the conventional Tube Tunnel (High Output) filament lamp for Special Applications (For Colour aspects) (LU drawing no. 6174-A3-103454) used in the signal head units for London Underground railway signalling.

The light source is generated from a cluster of high intensity LEDs mounted in a bespoke and coloured UL94 V0 rated housing fitted with a B15d 2-pin lamp cap to make it a direct replacement.

The units are designed to meet the highest LU Railway Standards as defined below:

• EMC to 1-196, 1-222, E7001, E7002, E7202 and EN50121-4
• Shock and Vibration to E7202 and BS EN 61373
• Humidity to E7202
• IP55 Protection to BS EN 60529 and E7202
• Colour Signal Class to BS 1376:1997 at a nominal 25 °C

Marl International developed the LUMARLED in partnership with London Underground to replace unreliable filament lamps in tunnel signal heads.

The products had to replace the optical performance of existing incandescent lamps used in the signal heads, and Marl was able to offer a design solution which fully matched the existing colour and focal point requirements.

The use of Marl LED technology gave London Underground added benefits in reduced maintenance and power costs, reduced service disruption and increased safety.
High intensity LED's in a choice of three different colours were selected to satisfy the existing optical requirements of this application and the LUMARLED is fully sealed to IP67 to protect against water and dust ingress. LUMARLED has guaranteed life of 5 years and is currently used extensively on London Underground lines.

This LED bulkhead replacement product has a multitude of applications, including use as a traffic signal on industrial sites and a hazard warning indicator for use on machinery and scaffolding. The unit has also been fully approved by Railtrack (Network Rail) for use as a buffer stop light on the UK rail network.

A combination of outstanding reliability and optical performance , plus a vandal and weather resistant housing (sealed to IP64) offers customers a cost-effective, fit and forget solution to indication problems.

Many direct benefits can be realised by upgrading incandescent sources to LED technology in these demanding applications, including huge improvements in reliability, reduced service disruption, reduced maintenance costs and lower power consumption. The above benefits offer the customer significant reductions in overall lifetime cost and increased user confidence. Railtrack Approval Number: PA05/898 (Network Rail)

T 1¾ sized, (MG S5.7s) midget groove style incandescent replacement featuring a high intensity LED element in a range of colours and voltages. Termination is centre contact Anode. This particular device is manufactured with a flat-topped LED to provide excellent wide angle viewing for switchtop and annunciator illumination.

T 1¾ sized, (MF SX6s) midget flange style incandescent replacement featuring a high intensity LED element in a range of colours and voltages. Termination is centre contact Anode. This particular device is manufactured with a flat-topped LED to provide excellent wide angle viewing for switchtop and annunciator illumination.

T 3¼ sized, (MES E10) Miniature Edison Screw style incandescent replacement featuring a high intensity LED element in a range of colours and voltages. Termination is centre contact Anode. This particular device is manufactured with a flat-topped LED to provide excellent wide angle viewing for switchtop and annunciator illumination.

T 3¼ sized, (BA9s) style incandescent replacement featuring a high intensity LED element in a range of colours and voltages. Termination is centre contact Anode. This particular device is manufactured with a flat-topped LED to provide excellent wide angle viewing for switchtop and annunciator illumination.

BA 15d based incandescent replacement featuring a cluster of 6 high intensity LED elements in a range of colours and voltages. This particular device is manufactured with internal potting for increased vibration reliability and LEDs to provide high on-axis viewing for indicator and annunciator illumination.

Marl International Limited's 238 series of bi-polar filament replacement bulbs are delivering significant benefits in rail signaling applications. The LED lamps feature a substantially longer life than traditional filament technology products, effectively providing a fit & forget solution.

Because the T6.8 slide base lamps last longer (typically over 100,000 hours) the contribute to an overall maintenance costs, inventory levels and abatements which can run into £1000's per minute. They are much less susceptible to vibration and shock - a major issue in rail signal indication - and also operate at a lower current, leading to savings in power consumption and a reduction in heat generated.

238 Series lamps are available flat topped for broad illumination, or with a dome, which enables light to be projected down a light tube for signal point illumination. They have a slide base fitting and are suitable for use in both AC and DC supply. They are also 'flicker free' when operating from an AC voltage. Distinct colour definition aids instant recognition by the signal operator - a critical safety factor.

238 LED filament replacement bulbs are part of a wide selection of LED products for signaling and lighting applications from Marl, may of which Rail authority approval, or are currently in the process of being approved. Railtrack approval number: PA05/697 (Network Rail).

The latest innovation from Marl is the SOLO range of filament bulb replacements. Unique circuitry allows this bi-polar device to be used at any voltage between 8 and 48V whether the supply voltage is AV or DC. This allows the user to reduce their stock holding and inventory costs, eliminated and potential confusion over polarity and problems caused by voltage spikes.