Huge stocks of led lights available in store and online -20% credit back instore!!!

We carry a range of LED lighting suitable for any size or space. Join the LED revolution and enjoy better yields and quality with less heat and quieter grow rooms.

Incredible LED offer live now! - Dont miss out!

We are currently offering 20% credit back on ALL LED GROW LIGHTS! - Thats right 20% credit back to spend on anything in store, no exceptions. This credit must be redeemed at the time of purchase of an LED light. For example buy a maxibright 660w pro led and receive £179.99 back to spend instore on those grow room essentials! No limit on amount bought, this offer is open to all for a limited time and is available instore only!

View all our LEDS now!

Sheffield store open to customers still!

We are open during lockdown, offering click and collect and call and collect at our store and free local delivery within 15 miles! Consultations are still available please get in touch to find out more....

Don't want to pre order? - You can turn up and order in person still for contactless pick up just let us know what you need when you are here.

Full Lockdown Services Information here!

Love hand watering? - Check out our hand water and hand water pro kits

Hand watering is the most common method used to irrigate pots of soil and coco, it's a great method but creates a couple of issues that growers need to overcome. Firstly run off is created by hand watering pots to the recommended 20-30% run off, leaving pots sat in this run off is bad news for your roots and can cause slow growth, both our hand water kits utilise baseline trays to allow run-off to collect in the baseline brain provided which pumps it to a separate waste tank or drain.

Secondly hand watering multiple pots is a pain, our hand water pro kits contain a pump, pipework and telescopic watering lance to make hand watering many pots a breeze! Not only is this a quick and easy method to water many pots it's also much better at hydrating all the coco/soil in a pot as the watering lance sprays out like a shower head - no dry spots in your coco!

Introductory offer! 20% off all soil or coco when you buy any hand water kit instore!!!!

Hand water kits here!

The Best LED Lighting Available - Huge Stocks

View all LED Grow Lights
Infrared Thermometer
Not specified Infrared Thermometer
Sale price£29.95
In stock
Maxibright Daylight iLink Cable
Maxibright Maxibright Daylight iLink Cable
Sale price£12.50
In stock, 3 units
Lumatek Zeus 1000w Xtreme PPFD LEDLumatek Zeus 1000w Xtreme PPFD LED
Lumatek Lumatek Zeus 1000w Xtreme PPFD LED
Sale price£1,549.95
Re-stocking soon
Daylight LED 480w ProDaylight LED 480w Pro
Maxibright Daylight LED 480w Pro
Sale price£749.95
In stock
Lumatek ZEUS 465w compact  LEDLumatek ZEUS 465w compact  LED
Lumatek Lumatek ZEUS 465w compact LED
Sale price£639.95
In stock
Maxibright Daylight 660w pro LEDMaxibright Daylight 660w pro LED
Maxibright Maxibright Daylight 660w pro LED
Sale price£899.95
In stock
Lumatek Attis 200w LEDLumatek Attis 200w LED
Lumatek Lumatek Attis 200w LED
Sale price£249.95
In stock
Maxibright Daylight 300w LEDMaxibright Daylight 300w LED
Maxibright Maxibright Daylight 300w LED
Sale price£349.95
In stock
Lumatek Zeus Pro 600w LEDLumatek Zeus Pro 600w LED
Lumatek Lumatek Zeus Pro 600w LED
Sale price£869.95
In stock

Find us....

Critical Mass Systems Sheffield

Unit 4, Holbrook Enterprise Park,


S20 3GL

Monday, Tuesday, Wednesday & Friday: 9AM - 6PM

Thursday 9AM - 7PM (Late Night)
Saturday: 10AM - 5PM
Sunday: 11AM - 4PM

Get directions