We will beat any genuine price, come and set up a customer discount account with us today!

Huge stock of LED grow lights available in store and online!!!

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.

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!

JANUARY SALE - ONLINE AND INSTORE EVERY DAY THROUGHOUT JANUARY!!!!

10% OFF THE FOLLOWING PRODUCT RANGES INSTORE AND ONLINE THROUGHOUT JANUARY!!! - To include all LED Lighting, get 10% off all LEDs online now!

IWS systems - flood and drain

CANNA - excluding media

Vitalink - all products

Ecothrive - all products

Buddhas Tree - all products

Biobizz - excluding media

Adjusta-Wing - all products

LED Lighting - all products

Heaters and Heating Accessories - all products

Discounts will apply automatically at checkout!

Our products

SET TO CONTINUE UNTIL THE END OF JANUARY!!!! SUPER SUNDAY - 20% OFF EVERYTHING (INSTORE ONLY) EVERY SUNDAY - GET GROWING FOR LESS EVERY WEEKEND!

20% off all published pricing check out our products online and only pay 80% of the price instore! Available every Sunday!

EXTENDED UNTIL THE END OF JANUARY!!

Take advantage now and stock up on those grow room essentials!

This will run alongside our main January sale, instore only, every Sunday!

* not in conjunction with any other offer or discount.

The Best LED Lighting Available - Huge Stocks

View all LED Grow Lights
Maxibright Daylight Lighting Controller
Maxibright Maxibright Daylight Lighting Controller
Sale price£274.95
In stock, 2 units
Lumatek 465w PRO LED
Lumatek Lumatek 465w PRO LED
Sale price£699.95
In stock
Daylight LED 480w Pro
Maxibright Daylight LED 480w Pro
Sale price£749.95
In stock
Lumatek ZEUS 465w compact  LED
Lumatek Lumatek ZEUS 465w compact LED
Sale price£639.95
In stock
Maxibright Daylight 660w pro LED
Maxibright Maxibright Daylight 660w pro LED
Sale price£899.95
In stock
Lumatek Attis 200w LED
Lumatek Lumatek Attis 200w LED
Sale price£249.95
In stock
Maxibright Daylight 300w LED
Maxibright Maxibright Daylight 300w LED
Sale price£349.95
In stock
Lumatek Zeus Pro 600w LED
Lumatek Lumatek Zeus Pro 600w LED
Sale price£869.95
In stock
Maxibright Daylight 660w LED
Maxibright Maxibright Daylight 660w LED
Sale price£849
Only 1 unit left

Find us....

Critical Mass Systems Sheffield

Unit 4, Holbrook Enterprise Park,

Sheffield

S20 3GL

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

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

Get directions