What wattage discharge lamp do I need for my venue?

The required wattage for a discharge lamp depends on your venue size, throw distance and application. For small clubs and mobile DJ setups, 150 W to 250 W metal halide lamps (10,000–22,000 lumens) are typically sufficient. Medium-sized stages and corporate events benefit from 400 W lamps (30,000–36,000 lumens), which are the industry standard for professional moving heads. Large venues, outdoor festivals and long-throw followspots require 575 W to 1,200 W lamps (45,000–110,000 lumens). Calculate your required lux level at the target distance and consult fixture photometric data to determine the appropriate wattage. LTT's technical team can advise on lamp selection for your specific application.

How do discharge lamps compare to LED alternatives?

Discharge lamps and LED fixtures each have distinct advantages. Discharge lamps — particularly metal halide types — deliver higher peak intensity from a compact source, creating sharper beams and more vivid aerial effects, which is why they remain preferred for large-scale touring productions and long-throw applications. They also offer superior colour rendering (CRI 80–95 for quality metal halide lamps) compared to many LED fixtures. However, LED technology has advanced rapidly: modern LED moving heads eliminate warm-up and restrike delays, consume less power, generate less heat and have much longer lifespans (20,000–50,000 hours versus 750–2,000 hours for discharge lamps). For applications requiring instant on/off control, low power consumption or minimal maintenance, LED is often the better choice. For maximum punch and traditional beam quality, discharge lamps still lead.

What ballast is compatible with my discharge lamp?

Ballast compatibility depends on three factors: lamp wattage, lamp type (metal halide, high-pressure sodium or mercury vapour) and ignition technology (pulse-start or probe-start). A ballast designed for a 400 W metal halide lamp cannot safely operate a 250 W lamp or a high-pressure sodium lamp of any wattage. Additionally, pulse-start lamps require electronic ballasts with pulse-start ignition circuits; older magnetic ballasts designed for probe-start lamps will not reliably ignite pulse-start types. Always check the lamp manufacturer's datasheet for recommended ballast specifications, and verify that the ballast voltage and frequency match your mains supply. LTT stocks compatible ballasts and ignitors from Philips, Osram and Venture Lighting, and our technical team can confirm compatibility for your specific fixture.

How long is the warm-up time for discharge lamps?

Metal halide discharge lamps typically require 2 to 10 minutes to reach full luminous output after ignition, depending on the lamp type and ballast. Pulse-start metal halide lamps with modern electronic ballasts warm up fastest, reaching 90% output in 2–3 minutes. Older probe-start lamps with magnetic ballasts may take 5–10 minutes to stabilise. High-pressure sodium lamps warm up slightly faster (1–3 minutes) but are rarely used in stage lighting due to poor colour rendering. Once extinguished, a hot discharge lamp cannot immediately restrike; the arc tube must cool for 5–15 minutes before the ignitor can re-establish the arc. This restrike delay is a significant limitation in live event applications where instant on/off control is required, and it is one reason why LED moving heads are increasingly replacing discharge types in touring rigs.

What is the difference between pulse-start and probe-start discharge lamps?

Pulse-start and probe-start refer to the ignition method used to initiate the electrical arc in a metal halide discharge lamp. Probe-start lamps contain a third starting electrode inside the arc tube and require a lower ignition voltage (1–2 kV); they take longer to warm up (5–10 minutes) and exhibit more colour shift over their lifespan. Pulse-start lamps eliminate the starting electrode and use a brief, high-voltage pulse (3–5 kV) to ionise the gas; they warm up faster (2–3 minutes to 90% output), maintain more stable colour temperature and offer better lumen maintenance over their rated life. Pulse-start technology requires compatible electronic ballasts — older magnetic ballasts designed for probe-start lamps cannot reliably ignite pulse-start types. When replacing lamps, always verify that your ballast supports the ignition technology of the new lamp.

Which discharge lamp suits outdoor events and architectural lighting?

For outdoor events and architectural floodlighting, high-pressure sodium (HPS) lamps in the 250 W to 1,000 W range offer the highest efficacy (80–140 lumens per watt) and excellent lumen maintenance, making them cost-effective for large-scale installations where colour rendering is not critical. Their warm yellow-orange light (2,000–2,500 K) suits decorative facade lighting and outdoor festivals. Where accurate colour reproduction is required — such as lighting performers, stages or branded installations — metal halide lamps are the better choice. A 400 W metal halide lamp delivers 30,000–36,000 lumens with a colour rendering index (CRI) of 65–90 and colour temperatures from 3,000 K to 6,500 K. Ensure outdoor fixtures have appropriate IP ratings (IP65 or higher) and that all electrical installations comply with local codes and DGUV Vorschrift 17 where applicable.

How often should I replace discharge lamps in touring fixtures?

Professional touring companies and rental houses should replace discharge lamps at 70–80% of their rated lamp life to maintain consistent output and avoid on-stage failures. A lamp rated for 1,000 hours should be replaced after 700–800 operating hours, even if it still lights. Implement a lamp tracking system that records operating hours for each fixture, and mark lamps with installation dates. Lamps used in high-vibration environments (truck-mounted fixtures, outdoor festivals) or subjected to frequent on/off cycling may fail earlier than their rated life. Inspect lamp sockets and connectors regularly for corrosion or carbon buildup, which increases contact resistance and accelerates failure. Keep spare lamps on hand for critical fixtures, and always test replacements before the show. Proper maintenance ensures reliable performance night after night.

Can I dim a metal halide discharge lamp with a standard dimmer?

No, you cannot dim a metal halide discharge lamp using a standard phase-control dimmer designed for incandescent or halogen lamps. Discharge lamps require constant current to maintain the arc; reducing voltage with a conventional dimmer causes the arc to become unstable or extinguish completely. To dim a metal halide lamp, you must use an electronic ballast with built-in dimming capability, such as Philips DynaVision or Osram Powertronic models. These ballasts can dim metal halide lamps down to 50–70% of full output while maintaining arc stability, though some colour shift may occur at lower levels. Dimming below 50% is generally not recommended as the arc becomes unreliable. Most professional moving-head fixtures with discharge lamps use mechanical shutters or iris diaphragms for intensity control rather than electronic dimming, preserving colour consistency and arc stability.

Discharge lamps

PHILIPS MSR Gold 700/1 MiniFastFit 1CT/4 700W 5700K 53400lm dim PGJX28 198V

PHILIPS MSR Gold 700/1 MiniFastFit 1CT/4 700W 5700K 53400lm dim PGJX28 198V The high-performance MSR Gold™ MiniFastFit metal halide discharge lamp features a very compact design and can be...

€1,345.65 *

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PHILIPS MSD Platinum 2 R 1CT/8 Studiolampe 132W MSD

PHILIPS MSD Platinum 2 R 1CT/8 Studio Lamp 132W MSD

PHILIPS MSD Platinum 2 R 1CT/8 Studiolampe 132W MSD MSD Platinum lamps open up new dimensions of creative freedom in entertainment lighting, with powerful, compact, and brilliantly intense light....

€142.62 *

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PHILIPS MSD Platinum 21 R 1CT/8 Studiolampe 470W Metallhalog beliebig

PHILIPS MSD Platinum 21 R 1CT/8 Studio lamp 470W Metal halide Any

PHILIPS MSD Platinum 21 R 1CT/8 Studiolampe 470W Metallhalog beliebig MSD Platinum lamps open up new creative possibilities in entertainment lighting with powerful, compact, and brilliantly intense...

€513.17 *

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PHILIPS MSR Gold 700/2 MiniFastFit 1CT/4 700W 7200K 47000lm dim PGJX28 198V

PHILIPS MSR Gold 700/2 MiniFastFit 1CT/4 700W 7200K 47000lm dim PGJX28 198V The high-performance MSR Gold™ MiniFastFit metal halide discharge lamp features a very compact design and can be...

€531.17 *

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PHILIPS MSD Platinum 20 RB 1CT/8 Studiolampe 470W MSD Platinum 85-110V

PHILIPS MSD Platinum 20 RB 1CT/8 Studio Lamp 470W MSD Platinum 85-110V

PHILIPS MSD Platinum 20 RB 1CT/8 Studiolampe 470W MSD Platinum 85-110V MSD Platinum lamps open up new creative possibilities in entertainment lighting with powerful, compact, and brilliantly...

€513.17 *

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PHILIPS MSD Platinum 200 Flex 1CT/8 Studiolampe 240W MSD Platinum 55V

PHILIPS MSD Platinum 200 Flex 1CT/8 Studio Lamp 240W MSD Platinum 55V

PHILIPS MSD Platinum 200 Flex 1CT/8 Studiolampe 240W MSD Platinum 55V MSD Platinum lamps open up new creative possibilities in entertainment lighting with powerful, compact, and brilliantly intense...

€256.58 *

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PHILIPS MSD Platinum 25 R 1CT/8 Studiolampe 550W MSD Platinum 85-115V

PHILIPS MSD Platinum 25 R 1CT/8 Studio Lamp 550W MSD Platinum 85-115V

PHILIPS MSD Platinum 25 R 1CT/8 Studiolampe 550W MSD Platinum 85-115V MSD Platinum lamps open up new creative possibilities in entertainment lighting with powerful, compact, and brilliantly intense...

€570.19 *

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PHILIPS MSD Platinum 400L Flex 1CT/8 24500lm 8000K dim 85-110V

PHILIPS MSD Platinum 400L Flex 1CT/8 24500lm 8000K dim 85-110V MSD Platinum lamps open up new creative possibilities in entertainment lighting with powerful, compact, and brilliantly intense light....

€513.17 *

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PHILIPS MST SON APIA Plus Xtra 250W E40 1SL/12 Natriumdampflampe

PHILIPS MST SON APIA Plus Xtra 250W E40 1SL/12 Sodium Vapor Lamp

PHILIPS MST SON APIA Plus Xtra 250W E40 1SL/12 Natriumdampflampe Reliable solution with fewer early failures than conventional high-pressure sodium lamps thanks to APIA (Active Philips Integrated...

€34.78 *

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PHILIPS MAS LED SON-T EM 8.1Klm 50W 727 E40 8100lm 2700K E40 n.dim 120-240 V

PHILIPS MAS LED SON-T EM 8.1Klm 50W 727 E40 8100lm 2700K E40 non-dimmable 120-240 V

PHILIPS MAS LED SON-T EM 8.1Klm 50W 727 E40 8100lm 2700K E40 n.dim 120-240 V Philips Master LED SON-T for street lighting offer a simple and quickly amortized LED solution for replacing...

€167.20 *

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PHILIPS MAS LED SON-T EM 9Klm 50W 740 E40 9000lm 4000K E40 n.dim 120-240 V

PHILIPS MAS LED SON-T EM 9Klm 50W 740 E40 9000lm 4000K E40 non-dimmable 120-240 V

PHILIPS MAS LED SON-T EM 9Klm 50W 740 E40 9000lm 4000K E40 n.dim 120-240 V Philips Master LED SON-T for street lighting offer a simple and quickly amortized LED solution for replacing conventional...

€159.69 *

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PHILIPS MAS LED SON-T EM 10.8Klm 65W 727 E40 10800lm 2700K E40 n.dim 120-240 V

PHILIPS MAS LED SON-T EM 10.8Klm 65W 727 E40 10800lm 2700K E40 non-dimmable 120-240 V

PHILIPS MAS LED SON-T EM 10.8Klm 65W 727 E40 10800lm 2700K E40 n.dim 120-240 V Philips Master LED SON-T for street lighting offer a simple and quickly amortized LED solution for replacing...

€225.43 *

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PHILIPS MAS LED SON-T EM 12Klm 65W 740 E40 LED-Röhrenlampe E40 C 4000K 12000lm kl

PHILIPS MAS LED SON-T EM 12Klm 65W 740 E40 LED tube lamp E40 C 4000K 12000lm kl

PHILIPS MAS LED SON-T EM 12Klm 65W 740 E40 LED-Röhrenlampe E40 C 4000K 12000lm kl Philips Master LED SON-T for street lighting offer a simple and quickly amortized LED solution for replacing...

€225.43 *

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PHILIPS MASTER SON PIA Plus 70W E27 Natriumdampflampe

PHILIPS MASTER SON PIA Plus 70W E27 Sodium Vapor Lamp

PHILIPS MASTER SON PIA Plus 70W E27 Natriumdampflampe MASTER SON PIA Plus is a high-quality high-pressure sodium vapor lamp with PIA technology for reliable outdoor lighting. Greater reliability...

€30.32 *

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PHILIPS MASTER SON PIA Plus 50W E27 Natriumdampflampe

PHILIPS MASTER SON PIA Plus 50W E27 Sodium Vapor Lamp

PHILIPS MASTER SON PIA Plus 50W E27 Natriumdampflampe MASTER SON PIA Plus is a high-quality high-pressure sodium vapor lamp with PIA technology for reliable outdoor lighting. Greater reliability...

€25.66 *

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PHILIPS MST SON APIA Plus Xtra 50W E27 1SL/24 E27 1SL/24 E27, 1SL/24

PHILIPS MST SON APIA Plus Xtra 50W E27 1SL/24 E27 1SL/24 E27, 1SL/24 Reliable solution with fewer early failures than conventional high-pressure sodium lamps thanks to APIA (Active Philips...

€17.92 *

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OMNILUX OSD 95V/575W GX-9.5 500h 7200K

Basics:GS=Gap Short (shortened electrode space)DE=Double Ended (double-sided lamp with threaded pin)SE=Single Ended (one-sided lamp)PAR=Lamp built in a parabolic reflector HMP=Due to their special...

€59.00 *

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OSRAM POWERSTAR HQI®-T 1000…2000 W 1000 W/D

Metal halide lamps for enclosed luminaires. Product features: POWERSTAR® quartz technology • Light colors: neutral white (N), daylight (D) • : High efficiency • E40 screw base...

€179.29 *

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OSRAM VIALOX® NAV®-E SUPER 4Y® 100 W SUPER 4Y

High-pressure sodium vapor lamps for open and enclosed luminaires. Product features: Lamp survival factor: 95 % after 16,000 h burning time • Lamp maintenance factor: = 80 % after 16,000 h...

€14.20 *

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Osram 64805 CP85 5000W G-38 230/240V

Additional product data Socket (standard designation) G38/50 • Rated power 5000 W • Rated voltage 240 V • Dimensions & Weight Diameter 61.0 mm • Length 279.0 mm • Helix...

€104.64 *

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OSRAM 64781, FEX, P2/27, 230V/240V, 2000W, Sockel RX7s, 300h

Additional product data Socket (standard designation) RX7s • Rated power 2000 W • Rated voltage 230 V • Dimensions & Weight Diameter 30.0 mm • Length 138.1 mm...

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€30.80 *

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OSRAM POWERSTAR HQI®-T 1000…2000 W 2000 W/N/E SUPER

Metal halide lamps for enclosed luminaires. Product features: POWERSTAR® quartz technology • Light colors: neutral white (N), daylight (D) • : High efficiency • E40 screw base...

€189.00 *

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OSRAM VIALOX® NAV®-E SUPER 4Y® 70 W SUPER 4Y

High-pressure sodium vapor lamps for open and enclosed luminaires. Product features: Lamp survival factor: 95 % after 16,000 h burning time • Lamp maintenance factor: = 80 % after 16,000 h...

€9.56 *

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Details

HSD-150/70 G12 Osram Discharge Lamp 150 W

Discharge Lamp 150 W : Light Source Type: Discharge • Light Source Power: 150 W • Light Socket: G12 • CCT: 7500 K • Dimmable: No • Power Supply: 95 VAC • Power...

€103.07 *

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