Because the cost of this meter is high, I did a lot of research before buying. I grow quite a few edible plants in my basement and only use LED lighting. Of the many models I researched, some were not suitable for LED lighting. Before I bought this meter, I used light meters that measure lux and/or lumens. During my research, I found that LUX and Lumens measure light intensity, while PAR meters measure the amount of useful light for plants. When using a lux or lumen meter, the readings can be misleading. For example, fluorescent or LED lamps have different Kelvin values. A 6500K lamp is much brighter than a 3500K lamp. On a lux meter, a 6500K tube will show a much higher light level than a 3500K tube, but the PAR for both may be the same or similar. If you use a light meter or lumenometer, you may be providing your plants with too much or too little usable light. If you don't provide your plants with enough usable light, they will grow slower and often become thinner. Giving off too much usable light can cause problems with the CO2 used for photosynthesis. This can be compensated for by adding more CO2, but it's much easier to maintain a useful level of light at the level your plants need for healthy growth. If you plan to use this meter outdoors to measure PAR at different times of the day, this meter has a feature that allows you to log readings for later use. Since I only use the meter to determine the lighting distance in a room, I didn't use this feature. This model comes with a telescoping pole that extends up to 33 inches, allowing you to hold the transducer in tight spaces. This would be useful in a greenhouse with wide rows of plants to check the PAR value in the middle of the row. For my purposes, I like being able to hold the device in one hand to see readings while holding the sensor at the top of the plants under the light. Since many of my plants are on lighted shelves overhead, a solid block won't work for me. The cost of this PAR meter isn't something many hobby growers want to invest in, but it is a concern for me. was invaluable. Now I can adjust the level of lighting to the needs of the plants. По моему опыту, большинство моих овощей, таких как мангольд, базилик, листовая капуста, петрушка и т. д., очень хорошо себя чувствуют при показателе PAR около 400. Растения, которые любят полное солнце, такие как помидоры, болгарский перец, шалфей, usw. gut mit PAR-Werten, die näher an 500-600 liegen. Seedlings and cuttings are usually kept at a temperature of 300-400 until they begin active growth. Yes, it was a lot of money spent on a useful light meter, but for me it was worth taking the guesswork out of how much useful light my plants are getting. I now know that my plants are getting optimal light for optimal growth and development. This gauge comes with a 4 year warranty but I hope it lasts much longer. So far I couldn't be happier with it. UPDATE 06/05/21: I've had this PAR meter for over a year and it's still working great. I use it often when planting new plants and checking the lighting while the plants are growing. I've included some photos of the plants I grow indoors so you can see how healthy they are. This PAR meter helps me to adjust the lighting to the needs of the plants. I hope this review was helpful to you.
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