Formerly Tidy Hydro | Established 2013

250w Philips SON-T PIA Plus HPS Bulb

250w Philips SON-T PIA Plus HPS Bulb

General Information

SON-T is a cost-efficient and reliable solution in High Pressure Sodium.

High Pressure Sodium lamp with clear tubular outer bulb, high output and long reliable lifetime.

  • Initial investment saving options with "Plus" concept
  • High lumen output, maintained over life
  • Minimal maintenance cost.
  • Clear tubular outer bulb
  • Ceramic discharge tube with Unique Philips Integrated Antenna (PIA) concept enabling long and reliable lifetime
  • "Plus" concept with high efficacy translates into high light output and improved lumen maintenance
  • Robust construction with few welding points is highly vibration- and shock-resistant, further reducing early failures and extending lamp life
  • Dimmable


Operating Specs
Power (Rated) (Nom)
400.0 W
Lamp Current (EM) (Nom)
4.5 A
Ignition Supply Voltage (Max)
198 V
Ignition Peak Voltage (Max)
2800 V
Re-Ignition Time (Min) (Max)
120 s
Ignition Time (Max)
10 s
Voltage (Max)
115 V
Voltage (Min)
85 V
Voltage (Nom)
100 V
Controls and Dimming
Run-Up Time 90% (Max)
5 min

Product Data

E40  [ E40]
Operating Position
UNIVERSAL  [ Any or Universal (U)]
Life To 5% Failures (Nom)
20500 h
Life To 10% Failures (Nom)
24000 h
Life To 20% Failures (Nom)
28000 h
Life To 50% Failures (Nom)
36000 h
System Description
External Ignitor
LSF 2000 h Rated
100 %
LSF 4000 h Rated
99 %
LSF 6000 h Rated
99 %
LSF 8000 h Rated
99 %
LSF 12000 h Rated
99 %
LSF 16000 h Rated
98 %
LSF 20000 h Rated
95 %

Mechanical and Housing

Bulb Finish
Cap-Base Information

Approval and Application

Energy Efficiency Label (EEL)
Mercury (Hg) Content (Nom)
20 mg
Energy Consumption kWh/1000 h
440 kWh

Luminaire Design Requirements

Bulb Temperature (Max)
450 °C
Cap-Base Temperature (Max)
250 °C
Color Code
220  [ CCT of 2000K]
Luminous Flux (Rated) (Nom)
55800 lm
Lumen Maintenance 2000 h (Min)
95 %
Lumen Maintenance 2000 h (Nom)
99 %
Lumen Maintenance 20000 h
88 %
Lumen Maintenance 5000 h (Min)
90.5 %
Lumen Maintenance 5000 h (Nom)
96.5 %
Chromaticity Coordinate X (Nom)
Chromaticity Coordinate Y (Nom)
Correlated Color Temperature (Nom)
2000 K
Luminous Efficacy (rated) (Nom)
137 lm/W
Color Rendering Index (Max)
LLMF 2000 h Rated
99 %
LLMF 4000 h Rated
97 %
LLMF 6000 h Rated
96 %
LLMF 8000 h Rated
94 %
LLMF 12000 h Rated
92 %
LLMF 16000 h Rated
90 %
LLMF 20000 h Rated
88 %
Ratio Scotopic/Photopic Lumens
Full product code
Order product name
EAN/UPC - Product
Order code
Numerator - Quantity Per Pack


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Delivery Information

We will dispatch your order as soon as possible and should normally be received within 3 to 5 working days in some cases please allow up to a maximum of 14 days. The delivery rate you pay is calculated on two things, the weight of your order and the postcode you enter. Currently we only deliver to the UK.

Delivery Rates
Weight Delivery Cost
0-5kg £3.50
5-20kg £7.50
20-30kg £15.00
30kg+ £50.00

Free shipping for orders over (Excluding bulky items) £150

Returns Policy and Procedures:

Your rights to return goods are protected under the EU distance selling directive. You are responsible for the cost and risk of damage when returning goods so postal insurance should be taken out to cover the value of the goods.

Unwanted Item(s).

If you have made a purchase form Tidy Horticulture you are entitled to cancel your order and return the goods within 7 working days for a full refund, including the cost of delivery. Notify us by telephone or email quoting the order number given and you will receive your refund within 30 days. Goods returned should be in a saleable condition and in their original packaging and with proof of purchase. Any unwanted items returned after this date will be at the discretion of management and any postage costs paid by us will be recovered.

Item(s) damaged in transit.

If your goods have been delivered by a courier and the item(s) or packaging are damaged then please sign for your delivery as ‘damaged’ and notify us by telephone or email within 48 hours. If the item(s) have been damaged in transit then you can return it to us within 30 days of receipt for a full refund or exchange.

Item(s) faulty.

If the goods delivered are faulty then you have a right to return them within 30 days. Make sure all warranty information is kept with your item. After 30 days you can also contact the manufacturer directly to enable them to rectify the problem for you. All goods must be returned in their original packaging for a full refund or exchange.


Tidy Horticulture
Unit 60 - 61
Faraday Mill Business Park
Faraday road
PL4 0st

Tel: 01752 225 225