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How To Tell If A HPS Bulb Is Burnt Out

If you want to know how to tell if a HPS bulb is burnt out, there are signs to look out for and expected life spans to consider. Compared to LED bulbs, gardeners know that HPS bulbs often need replacement. However, it cannot be obvious to understand when to replace them, and the last thing you’d want is to replace them too early or too soon. 

We all know how crucial it is to maintain the efficiency of growing light indoors, especially when at the early stages of plant growth. Therefore, greenhouse maintenance doesn’t stop with the usual cleaning and checking of indoor temperature and humidity. It’s also essential for the gardener to know what signs indicate burnt out HPS bulbs and when they’ll need replacement. 


How To Tell If A HPS Bulb Is Burnt Out And What To Expect


Signs to look out for

The most common sign to look for is if the area around the bulbs’ base has turned black. However, this doesn’t mean that you should wait for this physical sign to happen. For example, some gardeners change their HPS bulbs after four or even three harvests based on the fact that HPS bulbs only last 8000 to 16000 hours. 

Therefore, a darkened base’s physical sign may not be present, but the bulbs might already lose lumens. The chance of facing drawbacks in production can occur from this loss, so keep the two tips together in mind. If you notice darkening on the base and it will be your fourth harvest, there’s a good chance the bulb is close to burning out. 

Another telltale sign of burnt-out HPS bulbs is when they flicker a lot or shut off completely. It’s best to replace them because this can lead to a decrease in spectrum color. Remember that spectrum also plays a significant role in the growth lights’ efficiency, so if the bulb looks whiter instead of the usual orange, it’s time to change. 


When to change an HPS bulb

As mentioned earlier, you can wait until the fourth harvest to change an HPS bulb. However, different gardeners also have various founded considerations on when to change the bulb even if it’s not showing signs that it’s burnt out. First, you can replace the bulbs after 18 months, considering that they have a lifespan of 24,000 hours. 

Besides computing how many hours are there in a year, some HPS bulbs will also degrade faster. For example, those with a blue spectrum will also have this spectrum output deteriorate more quickly, making it useless. Instead of 18 months, it’s sensible to replace the HPS bulbs after 10 to 14 months.

The duration of using your bulbs also plays a role in when you should change them. Of course, using the bulbs for 12 to 18 hours a day will burn your HPS bulbs faster. You can even consider how it’s expected for an HPS bulb to last for 20,000 hours, but its intensity tends to lessen after 8,000 hours. 

To prevent problems from insufficient lighting, use a light meter to check the brightness, and consider replacing after the bulb loses 15%. Whether you choose to replace them every 12 or 18 months, ensure that you keep backups in case they burn out earlier. 


How Often Should You Replace An HPS Bulb

Experienced growers replace HPS bulbs every 6 to 10 months if they are under continuous use. Ideally, you want to replace them once a year if you’re using them for 12 hours on and 12 hours off cycle to ensure that their output is still optimal. On the other hand, you can replace HPS bulbs every eight months if they are in 18 hours on and 6 hours off cycle. 

This is why, as mentioned earlier, those who use HPS bulbs with a blue spectrum must replace them quicker because of the degradation of the spectrum itself.  The importance of knowing when an HPS bulb degrades is that it also dictates the potential loss in your yield. To make the explanation more straightforward, a loss of 20% output equates to a loss of 20% yield. 

You might also have to replace earlier if you notice darkening on the ends of the inner arc tube. Not only does this potentially indicate burning out, but the black discoloration will also block the light. Lastly, those who experience power outages should assume a shorter lifespan for their HPS bulb. 


Signs that the HPS bulbs are damaged or used

There will be instances that you feel unsure if the HPS bulbs you have are still new. If you suspect tampering, you can confirm this if there are black specks on the element’s bottom. Shipping can also damage the bulbs and cause scuffing on the base contacts, so always check first before using them. 



Maintaining the greenhouse is vital to ensure that your plants will get their optimal requirements. For lights, are you confident with how to tell if a HPS bulb is burnt out? For starters, you can check some darkening at the base as an indicator. 

Additionally, mark your calendar on when to expect your bulbs to degrade. Even if it isn’t your fourth harvest or it’s earlier than ten months, you may need to replace them, depending on their daily experience. The bottom line here is that you don’t have to wait for the bulbs to burn out, as degradation leads to low output and poor yield. 


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How To Care For Carpet Roses. 3 Factors To Master

How To Care For Carpet Roses. 3 Factors To Master

You have three factors to consider to know how to care for carpet roses. Gone are the days where roses are only centerpieces, but with proper care and maintenance, you might have one of the best groundcover plants. Carpet roses will undoubtedly improve any garden bed, and you’ll be pleased how they are not even demanding constant attention. 

If you want to protect your plants from challenging environmental conditions, you can also consider growing carpet roses in the greenhouse. This will make maintenance more comfortable, and you should face fewer challenges and problems. This article will teach you the ideal conditions and practices to keep your carpet roses blooming happily. 


In general, carpet roses are easy to grow and are relatively low-maintenance. However, the emphasis is necessary on knowing the variety you have and adjusting the plants’ practices and requirements accordingly. 


Factor #1. Location

The first consideration to ensure proper care for carpet or groundcover roses is in the ideal growing environment. Remember that even though groundcover roses are not picky in sites, they should still be in an optimal location to thrive. You can determine the ideal location of your carpet roses depending on their type

For example, some groundcover roses prefer full sun, but others will thrive in partial sun. You also want to plant them in well-draining soil because these plants are prone to drowning. After ticking these boxes, allocate enough space for the carpet roses to keep them from getting overcrowded that can cause problems over time. 


Factor #2. Maintenance

The second factor when caring for carpet roses is the practices in maintaining them. To start, remember that it’s crucial to plant them in a well-draining area. Overwatering the plants or leaving them in standing water can drown the plants or encourage root rot. Always check the ground if the roses need watering and amend the soil to improve its structure.

Carpet roses will also benefit from fertilizers. You can boost the plants and encourage them to fully cover the ground by feeding above and below the roses. Check the label instructions of your fertilizer and put your plants on a schedule for fertilizing regularly. 

Do you prune carpet roses? Depending on what type you have, some roses will benefit from pruning. You can cut the stems after flowering to keep the roses from overgrowing their area and maintain a tidy look. 


Factor #3. Common problems

Carpet roses, much like other groundcover plants, are prone to pests because of the large surface area they have. Therefore, prevention is vital to keep the pest population at bay. Gardeners often use insect spray or fungicides on the carpet roses to keep off insects or fungi. 

You can also practice preventative measures such as isolation of new plants and immediately removing plants with pests or diseases to prevent the spread. Always practice proper hygiene and sanitation to avoid bringing pests into the area. More so, maintain the ideal environment to discourage insects’ reproduction like aphids or the development of diseases like powdery mildew. 

Unlike other groundcover plants, carpet roses don’t have enough foliage to smother weed. Therefore, you want to use landscape fabric with drip irrigation on top to deter weed growth. You can also mulch under the systems or add a pre-emergent herbicide in early spring or fall to manage weeds.



How To Grow Carpet Roses

You can propagate carpet roses by rooting sections of the stem of a parent plant. Carpet roses typically develop rooted stems in spring or fall that you can dig up and repot. However, remember that the best propagation method will vary on the type of roses you have, 

You may also purchase potted ground cover roses, and you can transplant them in a bigger container or onto the ground outdoors. You can again grow bare-root carpet roses after the frost in the garden the same way you would when planting other roses. Amend the soil with organic matter and water the plants after putting and firming them in place. 

Because of their low-growing habit, you can have many uses for carpet roses. You can use them as borders or barriers for paths and driveways, add texture to a slope or wall, or fill a bed in the garden. However, be prepared that these plants can become leafless during the dormant season. 



One of the best groundcover plants to consider is carpet roses. However, you must know how to care for carpet roses to keep them healthy and looking tidy. To start, grow them in an ideal location to lessen the chances of developing drawbacks and problems. 

You can check the type of roses you have to know where is the best place to grow them. Once you have ensured the ideal location, maintain your plants by watering and fertilizing regularly. Be mindful not to overwater your plants as this can drown them, and you can also boost growth by feeding according to the label. 

You can also keep the roses from overgrowing their space by pruning after the flowering season. Lastly, do the necessary preventative measures to keep the roses from acquiring pests and diseases. Use fungicide or insect spray to keep fungi and pests at bay and maintain stable conditions to discourage growth and spread. 

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